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Dogs Diarrhea







What causes diarrhea?

Diarrhea is not a disease; rather, it is a symptom of many different diseases. Many mild cases of diarrhea can be resolved quickly with simple treatments. Others are the result of fatal illnesses, such as cancer. Even diarrhea caused by mild illnesses may become fatal if treatment is not begun early enough to prevent severe fluid and nutrient losses.


How serious is diarrhea in dogs?

Your veterinarian will attempt to determine how sick the dog has become as a consequence of the diarrhea. When the dog is systemically ill (that is, more than one body system is involved), some of the following may be noted:

  • Vomiting

  • Dehydration

  • Loss of appetite

  • Abdominal pain

  • High fever

  • Lethargy

  • Bloody and/or watery diarrhea

What types of tests are performed to find the cause?

If diarrhea is associated with several of the above signs, your veterinarian will perform a series of tests in the hope that a diagnosis can be made. This permits more specific treatment. Diagnostic tests may include radiography (x-rays) with or without barium, blood tests, stool checks, biopsies of the intestinal tract, and exploratory abdominal surgery. Once the diagnosis is known, treatment may include special medications and/or diets, or surgery.


If your dog does not appear systemically ill from diarrhea, the cause may be less serious. Some of the minor causes of diarrhea include stomach or intestinal viruses, intestinal parasites, and dietary indiscretions (such as eating garbage or other offensive or irritating materials).


A minimum number of tests are performed to rule out certain parasites and infections. These cases may be treated with drugs to control the motility of the intestinal tract, drugs that relieve inflammation in the intestinal tract, and, often, a special diet for a few days. This approach allows the body's healing mechanisms to correct the problem.


Improvement is expected within 2-4 days. If this does not occur, a change in medication or further tests are done to better understand the problem.





Diarrhea Questionnaire

  1. How long has the diarrhea been present?

  2. Is the diarrhea more severe now than a few days ago?

  3. Circle the description of each item that applies:


Watery stool

Stool is the thickness of pancake batter



Very bloody stool

Only sporadic blood present

Blood not present in stool

Bright red blood present

Dark, tarry blood present



Entire stool is soft or watery

Only portions of the stool are soft or watery

Diarrhea with each bowel movement

Diarrhea is sporadic (some bowel movements are normal)

Only 1 or 2 bowel movements per day

More than 4 bowel movements per day



Stool is dark brown in color

Stool is very pale in color

Stool is black and tarry in appearance



Thick mucus or pieces of tissue present in stool

Loss of bowel control (defecates in the house on the floor)

Severe straining when having a bowel movement

  1. Is your dog's appetite normal?

  2. If not, is he or she eating at all?

  3. What have you been feeding your dog during the last week? (Include dog or cat foods, treats, table foods, milk, and anything else that he gets on a daily basis. Also state what percentage of the diet is each item or category.)

  4. Does your dog have access to foods other than what you feed him? If so, what?

  5. Has there been a significant diet change in the last few weeks?

  6. If so, does that correspond with the onset of the diarrhea?

  7. Is your dog as active as normal?

  8. Describe any change in water consumption (up or down).

  9. Has vomiting been occurring?

  10. If so, how frequently and for how long?

  11. Does your dog go outside your house?

  12. Does your dog go outside your yard?

  13. Does your dog have access to garbage cans, either within your house or yard or outside your yard?

  14. Does your dog have toys that he plays with that could have been swallowed?

  15. Does your dog have access to sewing materials, such as thread or needles, or rubber bands, or string?

  16. Do you have other dogs or cats who live with this one?

  17. If so, does the other pet have diarrhea?

  18. Do any of the members of your family currently have a diarrhea problem?