Digestive Tract Disorders

Gastrointestinal Disorders in the GSD and Several Other Breeds
by Fred Lanting©1990

 


 Esophagus 
 Vomiting and gastritis 
 Torsion  
 Intussusception  
 Diarrhea and soft stool  
 Toxic gut syndrome (TGS) 
 Other problems  
 Eosinophilic ulcerative colitis   
 Irritable colon  
 Anal glands   
 Perianal fistulas  
 Polyps  
 The Pancreas   
 Clinical pancreatitis  
 Pancreatic atrophy 

 

EsophagusCongenital esophageal achalasia is also known by many other names such as cardiospasm, mega‑esophagus, dilated esophagus, and ectasia. The disorder appears to be caused by a simple autosomal recessive in German Shepherds, although it is highly variable in expression. While reportedly only about one percent of the dog population may be involved, mortality rate in pups is fairly high. Even when PRAA has been ruled out as the cause, I believe the percentage in German Shepherds is quite a bit higher than the reported one percent. Correspondents in the late 1990s have given me testimonial comments that they believe the incidence is on the rise, but this, too, may be more a matter of greater awareness. This abnormally large and flaccid “food-pipe” between the mouth and the stomach can be found in adults, but the most heartbreaking and serious cases are in pups early in the weaning and solid-food stage.

GSDs, Goldens, and Irish Setters seem most at risk, and if a pup survives to adulthood, the condition often causes or is associated with other esophagus problems, peripheral neuropathies, gastric dilation with or without torsion and especially myasthenia gravis. Even in adults, many are euthanized or asphyxiate due to progressive malnutrition, aspiration pneumonia, and owner frustration over the regurgitation. Most adult cases that are presumed to be acquired have no cause discovered, which leads me to believe it is simply a milder form of the genetic problem that causes death by starvation in most pups between 5 and 8 weeks of age. A loss of peristaltic action (that contraction that squeezes the food downward like a cow being milked) is probably due to a disorder of the afferent nerves. This 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.

Symptoms include slow or halted growth, weight loss, dehydration, water in the lungs, and persistent and progressively worse vomiting of food minutes after swallowing. The disorder usually is detected at or slightly after the commencement of weaning. As food slightly stretches the esophagus on the way down, an affected pup's muscles apparently fail to contract enough to prevent the food bolus from simply staying in a pouch just in front of the entrance to the stomach. In time, the muscles become weaker and even less able to squeeze the food ball, and even liquid food remains in a hanging “pelican pouch” forward of the stomach entrance and below it. As with PRAA, the pup becomes emaciated and listless, often dying of starvation. In fact, the two conditions may be indistinguishable without autopsy. The accompanying pedigree study gives food for thought.

Congenital pyloric stenosis is a similar disorder but is mostly found in Boxers and other short‑faced breeds; it is very rare in the German Shepherd. Spasm of the pyloric sphincter in excitable dogs, especially toys and miniatures, is also uncommon in the Shepherd Dog. There may be several other causes of esophageal dilation, affecting various breeds to different extents. However, German Shepherds have over thirteen times the incidence of esophageal disorders of all other breeds combined, though PRAA may be part of this statistic.

       Vomiting and gastritis — Vomiting comes easily to dogs. Grass eating and subsequent vomiting give rise to all sorts of explanations, the most popular being that the dog was sick and ate the grass to help him throw up. Actually, excess grass is more likely the reason for the reflex action. Dogs eat grass because they like the taste of it, just as with the case of garbage. Gastritis, an inflammation of the stomach lining, can be caused by the ingestion of too much grass, garbage, or indigestible materials. It can also be caused by viral or bacterial invasion, but much more common, especially in pups, is the presence of endoparasites: tapeworms, roundworms, hookworms, whipworms, and coccidia. Actually, tape­worms or roundworms can fill up the belly to the extent that they back up and cause vomiting from sheer bulk. The initial treatment for gastritis or vomiting may be withholding food and administer­ing Kaopectate every four hours.

TorsionCommonly called bloat, sometimes described as gastric dilation/volvulus, this is a ter­rifying and frequently fatal disorder that German Shepherds and many other deep‑chested dogs experience. A twisting of the entrance and exit to the stomach traps the food and gas, and as the stomach swells, the twist is more unlikely to be relieved with­out veterinary help. Great strides in surgical treat­ment have been made, but the key to reducing the high mortality is still time. Recognize the symptoms and get the dog to a veterinary surgeon, preferably an emergency or trauma‑oriented hospital. Simple dilation (swelling due to gas) may not be serious as long as the dog is able to pass food into the duodenum, but it has been estimated that 80 percent of all dogs that experience simple dilation will someday also have torsion.

Symptoms of torsion include a swollen, turgid abdomen; the sluggish action of the dog; his white, frothy, unsuccessful attempts at vomiting; and perhaps his scratching in the dirt to make a cool hole in which to lie down. Also, the spleen will feel like a hard lump. The spleen is normally wrapped around some of the stomach and therefore splenic torsion accompanies gastric torsion. When this happens, the return of the blood that flows through the spleen is shut off causing shock, the “immediate” killer.

The first thing your vet is likely to do is attempt to push a tube down the throat into the stomach so the gas pressure can be relieved. If he cannot get past the twisted part of the alimentary canal, he may opt for immediate surgery so he can un­twist the organs. One emergency veterinary service in the Detroit area uses a different kind of lavage tube in their treatment of acute torsion. The large diameter, stiff, black polyethylene pipe has a smaller, flexible tube inserted into it. This smaller tube is for warm water so that the stomach contents can be flushed out of the larger one for about fifteen minutes. In either case, once the dog has been stabilized, decisions can be made about whether to operate, or untwist a stomach or spleen still in volvulus.

Follow‑up surgical techniques are numerous, but the one with the most success in preventing future torsion is a tube gastrostomy. In this procedure, a rubber or vinyl tube is put into the stomach through the abdominal wall, and in a week the stomach wall at that point becomes attached with scar tissue to the peritoneum and abdominal wall. The tube is then pulled out. The surgical opening seals off in a few days, and since the stomach is fused to the abdominal wall, it is prevented from again twisting out of position. Regular gastroplexy, which is suturing the stomach to the abdominal cavity, is also widely performed. Because of these and other techniques, especially the rise of emergency clinics, the mortality rate among those that make it to the clinic while still alive has plummeted to about 15 percent. Another 15 percent or so die without being seen by the vet first.

Groups of scientists at many locations have been studying bloat for a long time, partly with help from such as Morris Animal Foundation, the GSDCA, and many others. So far, they have identified a number of likely causative factors, including behavioral traits.  Breed susceptibility is pretty obvious, with 25 percent or more of Great Danes, Saint Bernards, Weimaraners, and Irish Setters expected to suffer from bloat sometime during their lives. German Shepherd Dogs, Standard Poodles, Collies, and Gordon Setters are fairly high on the incidence lists, also. Some of the characteristics seen most often in dogs that had bloated include some stressful event, even minor, in approximately the eight hours prior to the incident, a fearful temperament, and consumption of fairly large quantities of non-food material. The only dogs I’ve had direct contact with that bloated were of impeccable character, but those may have been in the minority. Purdue researchers found no pattern in presoaking dry food or not, but a slight correlation between several smaller meals and less bloat. Others found no relation to soybean meal in the food, an early target of breeders looking for a primary cause. Adding vegetables and canned or meat scraps appears to help lower incidence. Most dogs (60%) bloated not immediately after vigorous exercise soon after a meal, but in mid- to late evening when resting or sleeping.

There is a familial element in torsion/volvulus in many, similar to the way cancer “runs in families”, but most cases don’t give a clue to hereditary factors. As in “toxic gut syndrome” which is also seen a lot in some GSD lines, it is almost impossible to tell which came first, the presence of abnormal bacterial populations and irritated intestinal or stomach linings, or the bloat itself.  Which is cause and which is effect is not going to be easy or even possible to determine. Some investigators suspect that breeders may be stuffing their small, young puppies’ stomachs too much, with results that show up only later in life. Work goes on.

            Less likely are other types of torsion, but they can be as life-threatening.  Splenic torsion can occur without gastric twisting, and an even more rare disorder is mesenteric root torsion. The mesentery is the white, fibrous, web-like or film-like tissue that connects the various sections of intestines to each other and to the abdominal wall.  Blood vessels travel through the mesentery, and if there is a twisting there, regardless of whether the intestine itself is closed off, the blood supply can be halted and the intestinal tissue can become necrotic. Bloody diarrhea, vomiting, abdominal swelling and/or pain, and shock or general collapse can be symptomatic. It may be the same as what some call “twisted intestines”. So few dogs survive that it is impossible to prevent recurrence or conclusively predict whether those are at greater risk for another attack than any other dog is.

Intussusception In young pups (and other animals including humans) the intestine can invaginate (one part slips inside another). The condition, also referred to as "telescoping intestines," occurs in adults, too, but not as frequently. Most common immediate causes include worms, obstruction by indigestible materials, garbage, or toxic substances. The German Shepherd seems to experience a high incidence of this disorder and I believe there is a genetic propensity, a familial trait, in certain bloodlines.

Diarrhea and soft stoolDiarrhea can be a symptom of any number of disorders from cancer to overeating, but is most often associated with disease or parasitism of the small intestine. Diarrhea or loose stool is quite common in the German Shepherd Dog, even when no physiological disease has been identified. However, since this is not a normal condition, the owner should make a sincere attempt to find and attack the cause. Some of the causative factors in true diarrhea are: pancreatic insufficiency, chemical or mechanical irritation of intestinal linings, parasites, microorganisms, and a psychosomatic condition related to the "high‑strung," emotional make‑up of the German Shepherd Dog. Foods that can cause loose stool include milk (if suddenly introduced into the diet), liver, fats, and those with a highfiber content. However, simple overeating is perhaps the most frequent culprit in adults.

Soft to runny stools may be an indication of a general inflammation of the stomach and intestines known as eosinophilic gastroenteritis. It is treated symptomatically with something to coat the lining, plus perhaps a steroid and Kaopectate, until the dog "heals itself." Many veterinarians administer Pepto-Bismol, also. In the case of young puppies with watery stool or repeated diarrhea, rush to your veterinary clinic with the pup and the stool samples. Most of the time the cause of diarrhea in a young puppy is serious, such as parvo or coccidiosis, perhaps with hookworm as well. The Campylobacter bacteria cause some cases of acute or chronic diarrhea, and most labs would have no trouble identifying this infection. Generally watery diarrhea is not an indicator of “campy”. Erythromycin antibiotic is 90% effective, although resistant strains may be evolving.

Toxic gut syndrome (TGS)This disorder has been identified as a specific syndrome, with some similarities to other disorders such as intestinal volvulus, which may have been blamed for death when TGS was the real villain. The German Shepherd Dog has a higher number of blood cells per unit of blood than do most other breeds, with 50 to 60 percent compared with 40 to 45 percent. When such a dog becomes dehydrated, thickened and/or lessened blood supply to the small intestine increases growth of bacteria that are always present there. These Clostridium and E. cold bacteria produce such quantities of toxins that the dog is unable to get rid of them fast enough, and death by poisoning occurs. By the time owners see symptoms such as discomfort when the abdomen is touched, attempts to vomit, and excessive salivation, it is probably too late. Prevention may be accomplished through dietary means (feeding Lactobacillus acidophilus, yogurt, or cultured buttermilk), or by the same toxoid vaccine that is given to lambs to prevent Clostridium perfringens types C and D. As research is done on this recently defined syndrome, more will become known as to the best treatment.

Other problems — Ulcers have been diagnosed too frequently in German Shepherds and may be related to pancreatic problems or other causes: it's difficult to tell, when several conditions exist at once, whether one is the cause or effect of another. Necrotic bowel syndrome, a disorder of unknown cause, is diagnosed usually on autopsy, when part of the intestine is found to be dead and rotting away. This condition may be synonymous with or overlap intussusception or other diseases. It takes a small toll, mostly among heavily linebred German Shepherd Dogs.

Eosinophilic ulcerative colitisThis syndrome is most common in Cocker Spaniels and German Shepherd Dogs. If your pup or adult has intermittent to constant diarrhea, with or without blood, this disease may be the cause. Initial treatment may include corticosteroids, antibiotics, and antispasmodics to see if the symptoms can be halted.

Irritable colonAlso known as spastic colon, this disorder with mucus in or on the surface of soft or frequent stools may be the result of stress. The best cure is prevention — breed stable temperaments and build confidence in puppies.

Anal glandsOccasionally, anal sacs may become infected, and the dog may scoot along on the ground, rubbing his rump in an effort to relieve the itch. This won't help, but you can easily "express" these glands. Lift the tail high with almost enough effort to lift the dog's rear off the table or floor, and very firmly pinch the sphincter including the sacs. Be sure to use a couple of layers of paper towel or some cotton to keep the liquid from squirting across the room or on you. Most dogs do not need attention nearly as much as owners think they do.

Perianal fistulas — Known by a number of names, these abnormal passages between two surfaces or an opening to the exterior, in the area of the anus, is a condition seen more in German Shepherds than in other breeds. While probably familial or congenital, the disorder is thought by some to be caused by an injury or an abscess. More likely, however, it reflects an immune system weakness. Symptoms include frequent licking or biting at the "vent," and a bad odor and pus may also be seen. If untreated, ulceration will develop. Only fair results have been reported with cryotherapy, which is freezing with liquid nitrogen or nitrous oxide. Since some veterinarians prefer to use familiar surgical procedures rather than cryosurgery, ask for a second opinion if you aren't sure, especially at a veterinary college clinic. Frankly, the prognosis has historically been very poor; there has not been a high satisfaction rate regardless of treatment method. But a pharmacological approach has come to the foreground in the late 1990s, that being the use of the immuno-suppressive drug cyclosporine in an oil base, fed twice a day for as long as 5 months. It has had some success so far, though researchers warn that remission of symptoms may not be permanent in all dogs (nor is it in the case of surgery), and this immunosuppressive treatment is extremely expensive, thanks not only to the drug but also to close monitoring by the veterinarian. However, even in those dogs not “cured” by the drug alone, it improves the condition of the lesions enough so that surgery is much less extensive and has a better chance of success.

PolypsRectal polyps are little round or teardrop shaped red to purplish balls. Sometimes they are clustered like tiny grapes, and are found very close to the anal opening or further inside the rectum. They should be surgically removed, since they rupture easily and are a potential site for infection. A drop of bright red blood recurring on the end of stools is a sign that you should have the dog examined for polyps.

 

The Pancreas

The pancreas is a rather long, V‑shaped gland that aids the digestion of food. It has two major types of cells or tissues. One group is endocrine in nature, which means it secretes hormones into the circulatory system, which in turn transports them to other glands and body parts; the other group empties into the digestive tract. Located near the stomach, it produces enzymes, bicarbonate, and hormones; the first two are delivered to the intestine, the third is secreted into the bloodstream. One major enzyme, amylase, breaks down the long starch macromolecules, while others break down fats and proteins. The endocrine (glandular) portion of the pancreas, which does not excrete into the alimentary canal but rather secretes into the circulatory system, functions in control of blood sugar level, and when defective, results in diabetes. Most GSD people, in America, at least, are concerned more with the digestive function than with diabetes. Just before publication, I also heard from fanciers in England who are concerned about pancreatic insufficiency, and since many of their lines are from recent German imports, this is possibly a more widespread problem than I had earlier suspected.

Clinical pancreatitisThe word clinical may be used to mean “frank” or “obvious”, at least to a veterinarian with the training and equipment. Most causes of this disorder are of unknown origin. Adult clinical pancreatitis is not tremendously common in the German Shepherd Dog, but when it does occur it is usually the middle‑aged, obese bitch on a fatty diet that has it. Chronic pancreatitis symptoms include emaciation, dull dry coat, and high appetite with poor digestion as seen by fatty, loose stools containing undigested starches. Treatment is accomplished mainly by correcting the diet.

Pancreatic atrophy — On the other hand, German Shepherd Dogs seem to have a considerable predisposition to pancreatic atrophy, also known as juvenile atrophy or pancreatic insufficiency, and certain bloodlines have been much more associated with it than others. For years I have referred to it as subclinical pancreatitis, because people who are not familiar with familial and breed tendencies are likely to miss the subtle signs. The disease usually starts before the dog is one year old, though many are three before symptoms are noticed. When lack of "drive," less coat lustre, coprophagia and/or poor weight are seen, have the stool examined by your veterinarian for abnormal fat level and absence or low level of the trypsin enzyme. If the problem is discovered before it becomes severe and chronic, Viokase™, a brand of powdered raw pancreas, added to the food half an hour or more before feeding usually produces good results. Another similar product is called Pancreazyme™. Getting enough to do the job without making the owner go broke is a tough balancing act, though. By the way, these types of preparations are also good for non‑specific diarrhea. Some owners with access to slaughterhouses claim some benefit from feeding raw pancreas, but there is not enough data with scientific controls to consider this anything more than anecdotal testimony. I believe there is a strong possibility that subclinical pancreatitis can worsen with neglect into an acute attack by enzymes on the pancreatic and surrounding tissues themselves, and that this condition may be the cause of many instances of diagnosed perforated ulcers. Texas A&M vet school is trying to get AKC and GSDCA funding to study and possibly identify a genetic marker for pancreatic acinar atrophy in the breed.

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Copyright  2001 Fred Lanting, Canine Consulting.  Mr.GSD@juno.com.  All rights reserved.  Please view his site Real GSD. 

NOTE:  A well-respected AKC and Schaferhund Verein judge, Mr. Lanting has judged in more than a dozen countries, including the prestigious FCI Asian Show hosted by Japan Kennel Club, the Scottish Kennel Club, a Greyhound specialty in England, and more.  National Specialties: 1994 GSD Club of America National; 1991 Tibetan Mastiff National; 1990 Shiba National; Fila Brasileiro Nationals (several times), Dogo Argentino National, Pyrenean Shepherd National.  Numerous Chinese Shar Pei and Australian Shepherd specialties; regional Anatolian Shepherd specialty. Numerous GSD, Rottweiler, & Boxer specialties worldwide.  He is also the author of several ‘must read’ books, including THE TOTAL GERMAN SHEPHERD DOG, CANINE HIP DYSPLASIA, CANINE ORTHOPEDIC PROBLEMS.  A former professional all-breed handler in the US and Canada, he has lectured in over fifteen countries on Gait-and-Structure (Analytical Approach), Canine Orthopedic Disorders, and other topics, as well as being a  Sr. Conf. Judges Ass’n (SCJA) Institute instructor. WV Canine College instructor & member, advisory board.  His full Curriculum Vitae is very impressive and we are grateful to him for sharing that knowledge on this site.