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Hello, this is Dr. Jess. I am sorry to hear about your dog. How long has your dog had black stools for?
There could be some bleeding with anal gland cancer that would result in blood in the stool, we would expect this blood to be red or maroon in color usually, however, because it is occurring very close to the end of the digestive tract. Black discoloration of the stool makes us worry about bleeding further up in the digestive tract, such as in the stomach. The blood turns black or dark and tarry in color as it is digested.
We can see changes in the color of the stool if the diet has been changed recently and there are colors or dyes in the food that could affect stool color. If she has recently switched foods, this is possible. Or has been getting treats that may be colored.
Otherwise, I would let your veterinarian know about the change in stool color and you can even drop a sample off for them to look at. They may recommend doing a blood test to ensure there isn't evidence of severe bleeding in the intestinal tract, and they may prescribe some gastroprotective medications.
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