The German Shepherd Dog is a very popular breed.
In fact, it is Number One worldwide although in the U.S. it ranks
much lower partly because of AKC clubs’ non-adherence to the
international Standards — usually in the AKC top ten, though. As a
result of there being so many GSDs, veterinarians and others
typically see more cases of most disorders than they do in other
breeds. Popularity has its drawbacks, and undeserved notoriety is
one of them. Take the incidence of dog bites, for example. Many
breeds have far more of a tendency to bite people than does the GSD,
although they don’t get the same “press” (publicity). Min-Pins, Skye
Terriers, American Cockers, Chows, and many others will sink their
fangs in you more readily and with less provocation. But the
popularity of Shepherds, Rottweilers, and a couple others is their
downfall.
Of course, not all popular breeds are involved in
as many biting incidents. You have to travel a long road to find a
Golden Retriever that has ever bitten a person, and Labs have an
intermediate incidence compared to others of its size. Nor do big
dogs bite more (although perhaps with more damage) — the mastino
types are usually placid, while the feists like
Chihuahua/terrier-types and mixes give credence to their name and
the word “feisty”.
That was just an example of generalizations that
abound in the dog world. Some are unfounded; others have a basis in
statistical facts. Another example is the incidence of hip
dysplasia. Rottweilers and American Pit-Bull Terriers may have
nearly the same percentage and typical severity of HD as in the GSD,
but the Shepherd is almost unique among breeds in that HD causes
more discomfort and lameness than same degree of looseness in the
joints of the more stoic breeds with some bulldog heritage.
Another problem seen quite frequently in the GSD
is the deficient immune system syndrome (a syndrome is a collection
of symptoms). It is characteristic of this problem to manifest
itself in one dog in a certain way, and in another dog in a
different way, a little like a pleiotropic trait. Some evidences are
so slight that many owners and vets miss or don’t guess at the
underlying cause. This leads the doctor to wrongly prescribe a
certain medicine or none at all, and the breeder to go ahead and
breed a covertly defective dog that should not be mated. Further
complicating the matter, and preventing as much progress as could be
had, is the subclinical nature (a lack of, or hardly-noticeable,
signs. Many intermittent or mild complaints that owners have are not
identified as related to the dog’s immune system, and others have
taken years of badgering by breeders before the veterinary community
has acknowledged what breeders had known all along. So you will find
some disagreement in some of what I will present in the following
material. I don’t want to just list a table of disorders under the
subject heading, but you might want to do that for yourself. Let’s
take a look at some of those immune-mediated disorders after a few
more words about the general subject.
The GSD has more than its “fair share” of
immune-related problems, and they appear in the intestines, eyes,
skin, and other places. The breed has many individuals with a
deficiency of a particular immunoglobulin called IgA, and this
genetic defect may be very close on the chromosome to genes
controlling general immune problems.
Autoimmune disorders
The dog’s “Defense Department” has a number of
soldiers: antibodies, immunoglobulin's, specialized cells, and more.
Some vaccine ingredients, adjuvants, or carriers have been known to
cause an over-reaction by this army and result in an autoimmune
situation in which the body also attacks its own cells. A recent
vaccination development called “recombinant vaccine”, helps avoid
bad reactions to vaccines or the medium in which they are cultured
or carried into the blood system, but is not effective against
parvo. Nowadays, the over-reaction is more often a matter of
genetics than any stimulus from vaccine components.
The German Shepherd Dog is at risk
for a number of immune system abnormalities, and while not all have
been directly linked to immune suppression, there is great suspicion
of a connection with most of them. We have seen such problems in the
breed as pannus (chronic superficial keratitis), corneal
dystrophies, and plasmacytic conjunctivitis in the eye; lupus and
anal furunculosis in the outer integument; and plasmacytic colitis
in the gastrointestinal tract; these we suspect are related to
autoimmunity. The various components and functions of many glands
and chemicals in the normal body are lumped together to refer to
their joint action of protection, and given the name “immune
response” or “immune system”. It involves such things as T cells,
phagocytes, white blood cells, antibodies (immunoglobulin's),
complement proteins, and others. Together, their job is that of a
second line of defense against antigens and other threatening
“foreigners”; the skin, mucous membranes, and stomach acid are some
of the first-line defense mechanisms that bodies have, and if
something harmful gets past the frontline troops, the interior guard
must go to work.
Invading organisms may be viral,
bacterial, parasitic, fungal, and may come into the body via
puncture, swallowed foreign objects, impurities in eaten material,
absorption through the skin, intake by the lungs, or other routes.
This second line of defense even goes after waste generated in the
cells, or abnormal cells which if left alone could become cancerous.
To do this, the soldiers must be able to recognize the enemy, and do
so by chemical means, such as “seeing” if the projections on the
suspects fit like jigsaw pieces into receptors carried by the
troops. If so, they attempt to neutralize by putting chemical
handcuffs or a half-nelson on those invaders until they can dispose
of them. Some of the home guard, macrophages, actually “eat”
bacteria; some poke holes in the invaders or mark them for other
cells to eat or destroy. When such interactions occur, the guard is
stimulated to call for reinforcements (multiply rapidly) to search
for more of the invaders’ ilk. Our B-lymphocytes have antibody
protein molecules on their cell surfaces that recognize the foreign
molecule called an antigen. One result of this encounter is that
these B “white blood cells” become antibody factories called plasma
cells, and can turn out their product for many years to come. Thus,
some diseases are warded off the rest of our lives because our
bodies continue to have patrolling soldiers that can recognize them.
The other type of defender lymphocyte is the T cell. They directly
kill “bad” cells without using antibodies. Besides killer T cells
there are helper T cells and suppressor T cells; the latter call off
the attack so the white blood cells (lymphocytes) don’t get carried
away over-multiplying (hopefully!) or that would present other
problems.
One hitch in the war machinery is that some
lymphocytes get confused and mistake normal body (called “self”)
proteins for the “bad guys”. If “Self” doesn’t kill off these
errant traitors, as normally happens in the embryo and very young
individual, we have what is called an “autoimmune” situation. An
oversimplification would be to say that the body is “allergic to
itself”. In any case, the body uses the home guard to attack and
possibly destroy part of itself (its self). Such a defect can
affect immune response all through the body. It is possible that
this is happening in pannus, “allergies”, lick granuloma, and a
number of other problems in your or my dog. In human AIDS, all the
active helper T cells are destroyed, so the body no longer has
adequate defenses against any and all antigens. In most disorders,
only one or two pathways are affected, so a problem may show up as
an itch, skin blisters, hemolytic anemia, a corneal defect,
rheumatoid arthritis, or something else in one or more organs.
Demodex —
One of the most easily identified immune-mediated problems is
demodectic mange. To distinguish between this and the purely
contagious sarcoptic mange, see some of my other articles or buy my
book on the GSD. The demodex mite is ever-present on nearly all dogs
and humans, but doesn’t cause a problem unless the host is weakened
by something, especially another immune system related disease or
stress. It is widely believed that stress of various kinds, whether
of a genetic origin such as a very nervous temperament, or either a
genetic or acquired immunodeficiency disease that suppresses T‑cell
function in the immune defense system, may be the major factor in an
outbreak of symptoms such as demodecosis in a dog. With lowered
cell‑mediated immunity, the individual reacts adversely not only to
the mite and its toxins, but also to the presence of other microbes
and antigens. “Neutering” reduces stress in the individual and helps
brake the spread in the gene pool. A bitch in estrus is in the
highest state of systemic stress that any dog normally encounters,
outside of severe trauma and shock. Often enough, demodecosis is
concurrent with another immune-related defect. If your dog has
demodectic mange, look for another condition that should be treated
at the same time. Is there a history of subclinical pancreatitis?
Has there been recent surgery or other physical or emotional trauma?
Any exposure to debilitating diseases? Even the minor stress of
teething may be sufficient to tip the balance and encourage sudden
proliferation of mites and their symptoms. Very healthy dogs rarely
show symptoms even when exposed intentionally by clinical
transmission of the mites. Stress (such as illness) seems to
"awaken" the mites. Combating demodecosis is largely a matter of
curing or controlling the dog's other ills, both physical and
psychological. Use of steroids is contraindicated because they
compromise the dog’s immune defense. See my “Total German Shepherd
Dog” book for more detail on this topic.
Pancreatitis:
In its chronic, subclinical, or often-undiagnosed mode, exocrine
pancreatic insufficiency (EPI or PI) is fairly common in German
Shepherd Dogs of certain bloodlines. It has even been identified
with demodectic mange, possibly because during the stress of the
dog’s affected digestion, its body is less able to immunologically
suppress the proliferation of the mange mites. Supplementation with
vitamin A and pancreatic enzymes should be supervised by a
veterinarian who is knowledgeable in this area and has been made
aware of the genetic nature of the problem in certain lines of our
breed. The occurrence in pancreatic insufficiency among German-line
dogs in the U.S. has increased since the 1970s, but I believe there
are a couple of different reasons for this, if it is an accurate
observation.
Malabsorption (poor
digestion and poor stool condition) are frequently seen in the GSD,
and in my experience, has been more so in the heavily linebred
typical lines in American-bred dogs since the 1970s.
EPI is one of the conditions that can contribute
to the malabsorption syndrome.
The symptoms can be exacerbated by physical or emotional stress,
change of food, and other things. I suspect that dogs with
subclinical weakness in immune systems or pancreatic function may be
most likely to show these reactions. With EPI, the fur often
becomes dry and brittle, and even lost to some extent, and
Staphylococcus infection scabs may appear on the skin because the
compromised immune system doesn’t allow the dog to fight off the
infection. The symptoms of EPI mostly show up when the TLi value is
down (Trypsin‑like immunoreactivity test). So there seems to be a
possible connection, with insufficient pancreatic function and other
resistance” all being tied to the immune system.
A dog with the sub-acute form of pancreatitis may
exhibit coprophagy, which means he eats his own (or others') stools.
It may be that he smells the undigested fats and carbohydrates and
instinctively consumes it as food to give those nutrients "another
chance." Often, the addition of liver to a low‑fat diet and daily
administration of enzyme powder or capsules, or regular
supplementation with ground pancreas if you are lucky enough to get
some from a nearby slaughterhouse, will bring the condition under
control or at least improve it. Researchers at Tulane University
found that a commercially available enzyme supplement could improve
blood analysis, neonatal vitality, digestion, and general health.
The manufacturers of Viokase™, a dried raw pancreatic enzyme brand,
have shown that supplement/medicine to be effective in combating
nonspecific diarrhea as well as German Shepherd Dog subclinical
pancreatitis. The juvenile-onset generalized demodecosis often has a
spontaneous semi-remission because of better stress management.
Dogs that exhibit symptoms such as much
flatulence, or intermittent diarrhea or pasty light-brown/yellow to
clay-colored stool, perhaps should be tested for levels of Lipase,
Protease and Amylase, or just fed the recommended preparations
without testing. But keep an eye out for other immune-system signs,
too. Some people perceive a probable connection or coincidence
between anal furunculosis (perianal fistulas) and EPI. Both of these
problems may show up in the same dog, strengthening the suspicion
that they are manifestations of the same underlying immune system
weakness. A great deal of the digestive tract functions and stages
may be affected one way or another by the same genes governing
immune response.
Pancreatic insufficiency is an abnormality that
suggests removal from the gene pool, whether the dog has a severe or
a mild case or is asymptomatic most of the time. Most vets take very
few hours of nutrition and practical genetics classes in vet school,
and then forget most of it because they don’t use it every day.
Breeders are sometimes more reliable sources of information.
Unfortunately, many people who offer their EPI males at stud do not
admit or declare any cautions about their dogs. As one observer
quipped, “It’s funny isn’t it, that those who deny all those things
have Viokase-V on the shelf in their back rooms?” Although it is
good for various unspecified causes of diarrhea, the product is so
much more expensive than Kaopectate, that it makes you wonder.
Bloat/Torsion/Volvulus:
Is there a connection between PI
and GDV (gastric dilation and volvulus)? There have been reports
from dog owners indicating that many episodes of EPI begin with a
bloating incident, or with a gastroenteritis, marked by vomiting and
blood tinged diarrhea. One observer said, “>From
the general info collected, the dog first bloats, which often leads
to torsion of the gut, which of course requires surgery for a
tacking of the stomach, and this is usually followed by a full blown
episode of EPI within a few months of the surgery.” I suspect that
there is, at least sometimes, a common root cause if these two
problems. Dogs with a history of bloating/torsion
and/or bouts of unexplained diarrhea are reported by several of my
correspondents to be quite likely to be EPI-carrier suspects,
although this observation is admittedly anecdotal.
Megaesophagus:
German Shepherds have over thirteen times the incidence of
esophageal disorders of all other breeds combined, although PRAA, an
unrelated heart defect that causes similar symptoms as caused may be
part of this statistic. Dr. Labato at Tufts U. School of Veterinary
Medicine says, “It [sometimes] may be secondary to … myasthenia
gravis, systemic lupus erythematosus (SLE is an immune‑mediated
disease), …[and possibly others].” Breeds susceptible to the
juvenile-onset, inherited type of megaesophagus include Irish
Setters, German Shepherd Dogs, and a few others. Frequently, large
dogs are diagnosed with the idiopathic form, which means the cause
is unknown. “In most cases we don't know the causes”, said Dr. Twedt
in the vet school at Colorado State University.
The characteristic loss of peristaltic action is
probably due to a disorder of the afferent nerves, which is why
there is no successful medical, pharmaceutical, or surgical
treatment. There may be a connection with other nerve disorders,
even giant axonal neuropathy, which mimics HD and GSD myelopathy.
Because of these similarities, some have hinted that a general
immune system deficiency is at the root of this problem, as it
appears to be in so many disorders.
Diagnosis of megaesophagus is confirmed by means
of various tests, some of which are intended to discover the
underlying cause, and may include the acetylcholine receptor
antibody titer that is used to diagnose myasthenia gravis. An
antibody titer is a blood test that looks for immune-mediated
disease — one in which the body attacks itself. One source I detail
in my GSD book states that the incidence of symptomatic
mega-esophagus in the GSD population in the US is at least 1%, but
about 18% of U.S. (AKC-lines) GSDs are carriers of the altered gene
(assuming autosomal-recessive inheritance). With 18%, the [risk],
even if you avoid linebreeding and stay completely away from all the
[known] lines, is extremely high. The pedigree study in “The Total
German Shepherd Dog” (www.Hoflin.com) indicates that both Bernd
Kallengarten and Lance of Fran-Jo were suspects in carrying the
recessive for megaesophagus, and the latter was known to produce a
considerable number of descendants with various other manifestations
of immune defects.
Intussusception:
In very young pups (and other animals
including humans) the intestine can invaginate (one part slips
inside another). The condition, also referred to as “telescoping
intestines”, also occurs in adults, but not as frequently. Most
common immediate causes include worms, obstruction by indigestible
materials, garbage, or toxic substances. However, since the German
Shepherd Dog seems to experience a relatively high incidence of this
disorder, I have to suspect the possibility that (other than those
above causes) there is a genetic propensity in certain bloodlines,
and perhaps interrelated to other “GSD disorders” — those more
common to this breed than most others.
Pannus: The GSD has
more than its “fair share” of immune-related problems, and they
appear in the intestines, eyes, skin, and other places. The breed
has many individuals with a deficiency of a particular
immunoglobulin called IgA, and this genetic defect may be very close
on the chromosome to genes controlling general immune problems. The
GSD, after the West Highland White Terrier, probably also presents
most of the cases of pannus, an eye disorder caused by lymphocytes
migrating into the cornea and causing blindness unless treated. More
and more vets are referring to it as chronic superficial keratitis;
CSK for those addicted to abbreviations. I have watched quite a few
eyeballs “peeled” in the surgical part of the therapy, in the days
when steroid drops in the eye on a frequent basis (several times a
day) for the rest of the dog’s life was the post-surgical treatment
of choice. Peeling was the more heroic procedure, when injection of
cortisone under the conjunctiva as a first step is not effective.
Today the drug cyclosporine is used to best advantage in pannus,
although a steroid such as dexamethasone is still effective. This
cyclosporine is the same drug, originally found as a component of a
Norwegian soil fungus, that is given to counteract the body’s
tendency to reject other people’s organ transplants. The drug is
given as an ointment or in food twice a day until the cornea is free
of the lymphocytes, then there is a once-daily administration; it
seems to work partly by causing the tear ducts to operate almost
full time. Enough is absorbed by the tissues of the eye to get into
the far reaches of the circulatory system where it does the other
part of its job, fighting those wayward lymphocytes.
No cure is in sight, since it is
highly likely that pannus is an inherited autoimmune disorder, and
people who have dogs with pannus will have to deal with the
frustration and regimentation of daily treatment for the dog’s
lifetime. The same situation has been nagging sufferers from human
autoimmune disorders for a long time. MS, multiple sclerosis, is
considered by most to be such a disease, in which T-cells attack
components of the central nervous system (brain, spinal cord and
some major nerves). One of those components, myelin basic protein (MBP)
has been experimentally fed to lab animals, and later to human MS
patients, and it was discovered that the severity of symptoms was
considerably reduced. Rheumatoid arthritis, dealt with more in my
book on orthopedic disorders, is another supposed autoimmune
pathology in which the T-cells act against parts of the joints,
especially Type-II collagen. Again, oral-dietary administration of
this type of collagen was fed to RA patients with significant
improvement in managing the disease symptoms such as number and
severity of swollen joints, gripping strength in the hands, and
subjective descriptions of pain or stiffness after rest or sleep.
Experimental treatments involving feeding normal cornea extracts to
dogs with pannus may have similar results.
Pannus was previously called
“keratitis superficialis vasculosa pannosa pigmentosa chronica”,
“German Shepherd Dog Keratitis”, and “Keratitis Überreiter” after
its Austrian discoverer, is an inflammation and pigmentation of the
cornea and sometimes involves the conjunctiva. It is rare in almost
every other breed, and in the GSD it usually appears around 3-5
years of age and in both eyes. By that time, many affected dogs will
have already been bred. Besides the hereditary, breed-dependent
predisposition there is an environmental component that brings it on
earlier and more certainly: ultraviolet radiation. UV rays in
sunlight trigger the onset of symptoms, explaining why an increased
incidence is observed anywhere during the sunnier months of the
year, and more cases are presented in higher elevations such as
Denver. This means that to avoid outbreaks of the acute phase, the
owner should not only keep up with the medication schedule, but also
make sure his dog is protected from exposure to strong sunlight,
even if reflected off snow or water, and especially at high
altitudes. Some dogs are kept indoors (glass windows filter out most
UV rays) and are walked in darker hours; some wear fitted
sunglasses.
Corneal dystrophy:
While I do not draw any definite connecting lines between pannus and
this disorder, I mention it because I think there may be an immune
system relationship. Small opacities may appear on the cornea over
the pupil or slightly off-center, and the novice might think the dog
has cataracts. It may be triggered by an allergic reaction or some
other cause, and show up as a small spot, varying from slightly
translucent to cloudy-white. The size is usually less than 5mm
across, round, oval, or horseshoe-shaped. Most eye specialists
refer to this type of opacity as "corneal dystrophy"; the spots do
not interfere with vision. In my experience the spots have faded
away in a few years after reaching maximum size. Corneal dystrophy
appears to be genetic, but is not serious. Probably less than one
percent of the breed is affected. I once had a bitch who developed
very small oval opacities, one on each cornea, after she was about
four or five years old. They finally and gradually disappeared
(shrunk to nothingness) by the time she was about ten years or more.
This bitch also developed atopic (allergic-type) problems marked by
itching feet and sometimes parts of the skin, but most noticeably by
an assumed feeling of excess phlegm in the throat. One of her many
sons developed the same transient and minor corneal defects,
appearing in maturity and going away without treatment by old age.
While it is possible that some of these opacities may be immune
system related, I think most are largely if not fully
environmental.
Pemphigus: Uncommonly
seen in dogs and more found in humans, this group of related
autoimmune disorders involves mostly the mucous membranes and skin.
You may never notice the spider-web mucosal condition in the mouth
or purplish, fragile splotches of skin in some forms. In some forms
it can produce ulcers in mucous membranes. Very high doses of
corticosteroids for life may control the disease, but this is
a controversial approach because steroids are generally
contraindicated in autoimmune diseases, and usually cause a great
deal of capillary rupture and bleeding. It may be best to just leave
these alone and see if they will “go away” on their own.
Primary Seborrhea:
I have no hard evidence, but I suspect seborrhea may sometimes be a
sign of an acquired autoimmune disorder. This disorder is a
condition in which there are scaly patches and a greasy feel to
parts of the dog’s skin. You will probably notice great difficulty
in keeping the ears clean and free of dark wax and yeast or fungus.
Often, the older, long-affected dog will have an over-all rancid
odor. Many of these cases are related to thyroid hormone imbalance,
and such an immune- and general endocrine-related disturbance may
become chronic and in need of very frequent bathing and/or ear
cleaning with little or no hope of remission.
I have seen many cases that have been brought on
after extended or repeated exposure to fleas and other factors. The
flea allergy or exposure may be the prime cause of the skin
condition, with the flea antigens weakening the dog’s immune
response and thyroid function, resulting in severe seborrhea. Or,
the immune defense weakness may be the prime cause of the dog not
being able to withstand fleas. Ask a veterinary dermatologist to try
to find the underlying cause as well as give you ideas on how to
treat for the symptoms. If the dog shows evidence of much itching,
it is usually called secondary seborrhea, which refers to a primary
cause being mange, fleabite allergy, or other trigger influences,
involves relatively large reddish-skin patches with hair loss, and
is often more scaly and less greasy than is the primary form.
Primary seborrhea is something GSDs seem to be more predisposed to
than are most other breeds, and it is this type that more affects
the ear with fungus growth, and sometimes an increase in bacterial
colonies on the skin. It is a chronic condition that requires
constant or renewed treatment regimens with no hope of eventual
cure, just some control.
Most owners of dogs so affected report
considerable success in managing or partially suppressing the
symptoms by attacking them on several fronts: get rid of fleas (and
the cats and carpets they rode in on!), clean the ears daily or
several times a week with a 50/50 mix of vinegar and water, and
temporary regimens of Soloxine (thyroxine) for perhaps two weeks at
a time. Your vet can suggest a dosage level to try, of this quite
safe internal medication.
Degenerative Myelopathy:
DM was once as “GSD myelopathy” because most cases in the early days
of investigation involved this breed. It is the first disorder that
comes to mind when German Shepherd Dogs and spinal lesions are
spoken of together. “Degenerative” means that it is chronic and
progressive, and “Myelopathy” means spinal cord disease. The first
symptoms are usually seen at about six to eight years of age and
have a duration of five to twenty-four months, perhaps a bit longer
if aggressive measures are taken, but who knows if they are really
effective? Initially, the dog does not seem to realize what position
his rear legs are in; soon he will begin to drag his toenails and
the top part of his paws, and later may tremble as if palsied.
Eventually, he will be unable to get up on all four legs, and by
this time most owners will have decided upon euthanasia. Symptoms
and histological changes are very similar to those in multiple
sclerosis (MS).
It is also seen (though rarely) in the Belgian
Shepherd and the Old English Sheepdog, and some authorities feel
that other breeds’ degenerative myelopathies are probably not caused
by the same immune-system deficiency as we have in the GSD. Autopsy
shows demyelination (loss of the insulating sheath) of the spinal
cord, destruction of some large axons (nerve cells leading from the
cord to smaller branch nerves), and abnormal cells (or certain cells
in abnormal locations). Similar signs may be seen in the brain,
kidneys, and intestines, giving further hints of the immune system
failure being at the root of this disease.
It may be that relatively high vitamin E dosages
may be helpful, but it is difficult to compare a particular dog’s
disease progression with a “what-if” situation. We have a good idea
that this vitamin is very helpful in immune response improvement, so
it is natural to assume a probable direct benefit in this
immune-related disease. 800 units (IU) a day may be enough,
although some years ago one researcher claimed that 2000 IU of
vitamin E daily, 500 mg of vitamin C twice a day, and a
high-strength vitamin B complex twice a day was the best dosage. In
DM dogs, low serum and tissue concentrations of vitamin E have been
observed. I recommend that vitamin E be given to all older German
Shepherd Dogs for general resistance and health. It can’t hurt —
they will excrete anything they don’t need, within reason.
Chemical-pharmacological treatment has largely been via the use of
aminocaproic acid, and more recently, acetylcysteine three times a
day found acceptance, although conventional drug therapy (medicines)
has been of little lasting help to patients with DM. The combination
of exercise, vitamins and certain drugs seem to have delayed the
progression of DM in many dogs. Treatment has been directed at
suppression of symptoms and the multi-pronged approach may prolong
the day you have to face euthanasia because of debilitation and
inability to stand to defecate or to walk.
Lick Granulomas:
Dogs with GSD myelopathy often develop lick granulomas on hind feet,
which are non-healing ulcerations or (if you are lucky) callous-like
reactions of the skin to extremely frequent licking, sometimes
chewing, at the location of a supposed itch. It is probably a case
of the limb feeling as if it has “fallen asleep”, to put it into
terms familiar to human experience. The tingling sensation caused by
incomplete and erroneous signals by the nerves serving that place is
much like the irritation caused by an ant bite, or hairs out of
place, or anything in between. In trying to lick it away, the dog
actually softens and wears away the hair and skin. Lick granulomas
are not restricted to dogs with DM, but often occur on the pasterns
or toes in dogs that have atopic allergies, another clue to the
presence of a general immune system deficiency.
Other problems: Keep in
mind that the various parts and systems of the body are all
inter-related, that a disruption in the process of one may have an
origin or an effect in another. The endocrine system is a prime
example, with hormones being produced in more than one gland and
greatly influencing some or all of the other glands. Something that
has not yet been thoroughly explored in veterinary schools or with
research grants is the collection and inter-relation of problems
very common to GSDs, with yeast/fungal infections, flea saliva
allergens, and general autoimmune system weakness. I have observed
countless cases of dogs in this breed with a combination of
seborrhea, low resistance to fleas, thyroid insufficiency, nagging
ear infections, interdigital pyoderma, and other “complaints”. The
lines between these dots, I hope, will someday be drawn with more
clarity.
[Author Fred Lanting <mrgsd@hiwaay.net>
is an international show judge for many registries, presents
seminars and consults worldwide on such topics as Structure,
Orthopedic Disorders, Training Techniques, and the GSD. Fred invites
all to join his annual non-profit Sieger Show and sightseeing tour.
He actively trains in schutzhund, and breeds occasional litters of
GSDs (see his dogs on
http://www.angelfire.com/de3/jagenstadt/vonsalixHome.html ).
Most articles can also be found on <http://siriusdog.com/lanting.htm>
or others by a Google search for his name. Reprint permission of
these copyright pieces can be requested and should carry this or a
similar notice at the end.]