Overview of Chronic Vomiting in Dogs
Vomiting and chronic vomiting in dogs is a common symptom of sicness or poisoning in dogs. Vomiting is the forceful ejection through the mouth of the contents of the stomach. Occasionally material from the duodenum of the small intestine also accompanies the stomach (gastric) contents. Chronic vomiting is characterized by persistent or recurrent vomiting for more than two weeks.
An occasional bout of vomiting is common in dogs; however, persistent, chronic vomiting is usually indicative of an underlying disease. Chronic vomiting often leads to decreased absorption of nutrients and subsequent weight loss. Diarrhea may also accompany the vomiting.
General Causes of Canine Vomiting
Dietary indiscretion (eating inappropriate food/material)
Infectious agents, such as bacteria, fungi, and parasites
Drugs and certain toxins
Obstruction/blockage of the stomach or intestinal tract
Metabolic diseases such as liver and kidney disease, or hypoadrenocorticism
Abdominal disorders such as pancreatitis, abdominal tumors and adhesions, etc.
Motility disorders of the gastrointestinal tract that prevent the posterior movement of food
Inflammatory bowel diseases
Miscellaneous conditions such as gastric/duodenal ulcers, hiatal hernia, constipation, etc.
Cancer of the gastrointestinal tract
What to Watch For
Presence of blood in the vomitus or stool
Diagnosis of Chronic Vomiting in Dogs
Obtaining a thorough medical history with details on the timing and material vomited is very important. A thorough physical examination is performed, including careful palpation (examining by hand) of the abdomen. Additional diagnostic tests may include:
Complete blood count (CBC)
Chest and abdominal radiographs (X-rays)
Multiple fecal examinations
Treatment of Chronic Vomiting in Dogs
Chronic vomiting is difficult to treat symptomatically, because effective treatment usually depends on the underlying cause. There are several steps your veterinarian might recommend, however, while diagnostic testing is underway. The goals of symptomatic therapy are to initially rest the gastrointestinal tract and then introduce easily digested materials. Symptomatic treatments include:
Withhold all food for 12 – 24 hours, then gradually introduce a bland diet.
A trial of a hypoallergenic diet may be started, for a minimum of six weeks, if dietary hypersensitivity is suspected.
Antiemetic drugs that symptomatically decrease the frequency of vomiting may be tried.
Antacids (drugs that block acid production by the stomach) may also be administered.
Gastric protectants, which are drugs that coat and sooth the GI tract, may also be considered.
Administer only the prescribed medications and diet recommended by your veterinarian. Observe your pet very closely. If clinical signs are not improving, and/or your pet is getting worse, have your pet evaluated at once.
In-Depth Information on Vomiting in Dogs
Although vomiting is common in dogs due to their indiscriminate eating habits, chronic, protracted vomiting is not normal. Vomiting is often preceded by restlessness, salivation, and retching, and requires forceful abdominal contractions to expel the stomach contents. One must differentiate acute from chronic vomiting. One must also differentiate vomiting from regurgitation, which is the effortless evacuation of fluid, food, or mucus from the esophagus. The causes, diagnostic tests, and treatments for regurgitation are quite different from those for chronic vomiting.
Chronic vomiting generally does not respond to symptomatic therapy, and most often necessitates a full diagnostic work-up to determine the underlying cause. If the patient continues vomiting despite being kept off food, if the vomiting is recurrent, and/or if blood is present in the vomitus, your veterinarian should examine the animal. In addition, if your pet appears to be in distress, seems painful, lethargic, or sick in any other way, you should contact your veterinarian at once.
Causes of Chronic Vomiting in Dogs
Chronic vomiting can be caused by diseases of the gastrointestinal tract or can occur secondary to other systemic diseases. It is important to try to establish the cause of chronic vomiting. If the underlying cause is not removed or treated, it is unlikely the vomiting will resolve.
Chronic, recurrent dietary indiscretion can include eating spoiled food, overeating, ingesting foreign material, and sudden dietary changes.
Dietary intolerance is a reaction to some normal food component. It is most often a response to a particular protein, but can be associated with lactose, diets high in fat, and certain food additives.
Bacterial causes of chronic vomiting include Salmonella and Helicobacter.
Fungal causes of chronic vomiting include histoplasmosis, aspergillosis and phycomycosis.
Parasitic causes of chronic vomiting include roundworms, hookworms, whipworms, Giardia, and Physaloptera.
Administration of certain drugs and/or exposure to toxins can cause chronic vomiting by directly irritating the lining of the gastrointestinal tract. Examples include nonsteroidal anti-inflammatory drugs, corticosteroids, certain antibiotics, insecticides, heavy metals, and lawn and garden products, etc.
Slowly developing obstruction or blockage of the gastrointestinal tract may cause chronic vomiting. Obstruction may be secondary to foreign bodies, tumors, intussusceptions (telescoping of the bowel into itself), parasites, and other structural abnormalities.
Metabolic diseases, such as kidney and liver diseases, uncontrolled diabetes mellitus, and hypoadrenocorticism (Addison’s disease), may cause vomiting, although it is more common for these diseases to cause acute episodes of vomiting.
Some abdominal disorders may result in chronic vomiting. Examples include chronic pancreatitis (inflammation of the pancreas), kidney infections, tumors in other abdominal organs, adhesions of the abdominal organs, etc.
Motility disorders of the stomach and small intestines are an important cause of chronic vomiting. With these diseases food does not leave the stomach and intestines as it normally does and builds up in the stomach where it induces vomiting.
Inflammatory bowel disease (IBD) is an inflammation of the walls of the gastrointestinal tract, and may be an immune disorder in some animals. Chronic vomiting with IBD may be accompanied by diarrhea, weight loss, and a change in appetite.
Certain maldigestion and malabsorption problems, such as lymphangiectasia cause chronic vomiting, diarrhea, and weight loss.
Gastrointestinal ulcers associated with intestinal diseases and tumors, liver disease, and kidney disease may result in chronic vomiting, but such ulcers are uncommon.
A hiatal hernia is the sliding of first portion of the stomach into the chest cavity through the diaphragm, and allows foodstuffs to move back up towards the mouth
Constipation is infrequent, incomplete, or difficult defecation with the passage of hard, dry feces. Vomiting may occur secondary to constipation.
Slow growing tumors of the gastrointestinal tract may produce intermittent vomiting that tends to get worse with time.