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My dog has IBD. Why is he vomiting bile after switching foods?

Updated On September 23rd, 2025

Pet's info: Dog | Miniature Poodle | Male | neutered | 1 year and 9 months old | 15 lbs

After months of IBD and diarrhea, we switched jack to Royal Canin KO formula. All poop issues 100% resolved, but then the vomiting started. Always bile. Omeprazole and Pepcid have been unsuccessful. Since it started when we started the KO, I assume it’s related but I’m nervous to switch lest poop problems come back. Looking for novel protein, with grain, with no peas/potatoes/chickpeas/lentils. Would you recommend Purina Pro Plan Focus Adult Sensitive Skin & Stomach Salmon & Rice Formula Dry ?

1 Answer

Most Helpful Answer

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Answered By Dr. Elizabeth

Veterinarian

Published on October 3rd, 2019

I'm not sure this vomiting is related to the new food. One would expect that the colon and the stomach should be one the same page since they are all part of the same tract. So if a food upsets the stomach, it is likely it will upset the colon. The fact that the KO fixed the colon (ie the poop issues) but now Jack is vomiting is not expected and is unusual. I don't recommend to switch the food unless your vet advises it. Instead, call your vet. They may recommend steroids or another medical treatment for the IBD. They may also recommend an abdominal ultrasound to rule out a cancer like GI lymphoma. If you do want to try a food, I recommend a hydrolyzed diet since it will diagnose all types of adverse food reactions. The formula I recommend is Royal Canin Ultamino. I hope this helps to guide your decision and please feel free to post any additional questions.

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