Why is my dog's poop dark after starting Apoquel medication?

The change is stool color is probably from the medication or new supplement. It doesn’t look like it is from blood from the photo. As long as he’s feeling fine finish the antibiotics and check the stool after they are done. It should go back to his normal stool color. If the dark stool continues then I recommend having it checked for occult blood and intestinal parasites. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Bruno.

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Ace. This is likely a temporary side effect of the deworming treatment. It can cause some upset stomach, and the dark brown color of their poop may be normal. I'd just continue to monitor them for now. I hope this helps!

More than likely it is from the change in food but black, tarry stool can be a sign of gastrointestinal bleeding. You could take a sample to your vet, when you notice that it is black, and have it tested for blood. That way you will know if it is anything to worry about or just normal color change.

While the stool looks dark it does not look black and I think the color is a variation of normal. I think the other things look like millet bird seed or some other kind of plant material - it doesn’t look like any kind of parasite. I wouldn’t be concerned unless Aura develops diarrhea or is having trouble defecating.

I'm concerned about this stool. Dark tarry stool like this can be a sign of stomach or intestinal bleeding. The bleeding could be from medication, parasites, a gastric ulcer or cancer. I'm glad Truman is feeling better but I recommend a veterinary exam soon. They will run a blood panel to check for anemia, perhaps check for intestinal parasites, and perhaps due some X-rays. It's important to find the cause of this so this doesn't become a more serious medical problem. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Truman.

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Apoquel will not work if the dog has a skin infection. I recommend anytime that the apoquel has stopped working that the dog be taken to the Vet for an exam to check for a bacterial or yeast infection. Most dogs with allergies need to be on a special diet, apoquel or cytopoint, an antihistamine and an Omega 3 supplement to keep the dog comfortable, but flare ups are bound to happen, we just hope less frequently. As for the bloody diarrhea, it is likely unrelated to her skin and the apoquel but it is fine that you stopped it. Especially if it wasn't working. The blood indicated inflammation in the colon. Common causes of diarrhea are: intestinal parasites, viral or bacterial infections, dietary indiscretion, pancreatitis, food allergy/intolerance, reaction to a new food/treat/table food. If the diarrhea is bad I would fast her for 12-24 hours to rest her GI tract then start feeding a bland diet of boiled chicken or hamburger with rice. Feed 1 cup per 20 lbs per day until 2 normal stools. I wish you the best!

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. Yes, this would be expected as the surgical site is likely oozing a small amount of blood causing the stool to become tarry black. If this does not resolve or worsens, I would recommend having the veterinarian recheck her. I would also recommend checking her gum color and ensuring it is nice and pink. If it is pale, you need to have her seen immediately. I hope this helps guide you in the right direction! Please let me know if you have any other questions or concerns and I would be more than happy to help you further.