by Vickie Halstead, RN, CCRN, CEN, CVNS, LNC
Vomiting and diarrhea are symptoms of many diseases and conditions, and require veterinary consultation if persistent. Digestive disorders are common in dogs, evidenced by the frequency of email questions received on this topic by the BFCA health committee. Fortunately, most episodes of digestive upset resolve quickly.
The digestive tract (GI tract, or gastrointestinal tract) moves food from the esophagus to the rectum, taking 8-10 hours for a meal to pass. The organs along this route serve to break the food down into nutrients that the body’s cells can utilize: proteins, fats, and glucose (sugar). The organs of digestion include the stomach, small intestine, large intestine (colon), pancreas, liver, and gallbladder. Any dysfunction of these organs can cause vomiting and/or diarrhea, which can lead to dehydration and loss of electrolytes (sodium, potassium, chloride).
Dogs that are nauseated prior to vomiting may exhibit these signs: hypersalivation, anxiety, and repeated swallowing. The consistency of the vomit or loose stool must be documented. Vomit may include undigested or partially digested food, or a yellow color denoting the presence of bile that indicates the stomach is empty. Diarrhea that is watery or bloody needs veterinary intervention, as does blood in the vomit that may look like coffee grounds. A dehydrated dog will appear lethargic and listless, and may have difficulty walking due to weakness.
Dogs that exhibit frequent or persistent vomiting or diarrhea require veterinary intervention to determine the cause and treatment, plus prevention of dehydration. Potential causes of GI upset include:
A responsible dog owner will strive to prevent digestive upset by:
Treatment is aimed first at resolving the symptoms to prevent dehydration and electrolyte imbalance, then finding the cause with blood tests, fecal exams, and xrays. Vomiting is a coordinated effort of the GI tract and brain to expel the contents of the stomach. Diarrhea indicates the GI tract is irritable and overactive in its attempts to empty the intestines and colon. Your veterinarian may prescribe medications that:
1. Reduce stomach acid production (Tagamet, Pepcid)
2. Work on the brain to reduce nausea (Compazine, Thorazine)
3. Slow down the motility of the GI tract (Reglan, Tylon, Immodium)
4. Reduce inflammation for chronic diseases such as colitis, IBD (steroids)
Diet changes on a temporary basis that allow the GI tract to rest may be helpful for treating vomiting and/or diarrhea. Try a bland, easily digestible, low-fat diet such as hamburger (pour off the fat) or boiled chicken with rice or a canned food prescribed by your veterinarian. Also, canned pumpkin is well known for soothing the GI tract. Small, frequent meals may be helpful as well on a temporary basis. If you feed your dog once per day and vomiting occurs around 12 hours later, you may need to feed twice per day, or give healthy treats the opposite time of the day.
Probiotics (beneficial bacteria) must be considered in treating dogs with digestive disorders. The natural flora of bacteria in the intestinal tract must be balanced for the dog to maintain a healthy immune response to allergens, toxins, and infections. If the balance of the good bacterial flora in the gut is restored, the irritability of the GI tract will be reduced. Probiotics (sometimes called Acidophilus) include lactobacillus, bifidobacteria and enterococcus. Giving probiotics can improve digestion, synthesize vitamins, inhibit the growth of bacteria that cause disease, and produce immune stimulating factors and anti-inflammatory properties. Probiotics can be purchased in health food stores and are contained in yogurt, some dry dog foods, and some dog supplements. Some breeders give their dogs daily doses of probiotics or yogurt, especially during treatment with antibiotics that kill invading bacteria as well as beneficial bacteria.