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Why is my dog gassy and farting after changing to a new food?

Updated On September 23rd, 2025

Pet's info: Dog | Dachshund | Male | unneutered | 3 years and 6 months old | 11 lbs

Dog has been pacing the last few days when it happens I take him out and he farts while pooping he has been farting for just over a month when he poops. Changed his food a month ago from royal canin to wellness small breed and I think the new food is giving his gas I read that peas and tomatoes cause this and the wellness small breed has both. So today I got him some royal canin gastro wet food to eat for the next few days.Brought him to the vet today for a physical she said everything looks ok.

2 Answers

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on March 16th, 2017

Yes, you are correct that the change in diet can cause Quincey to have this gas. It was an excellent idea to bring him to the vet for a health check, and I'm glad she said everything looked ok. I think it's also an excellent idea to feed him the Royal Canin gastro for the next few days. If that helps with his gas, I would slowly add back in his diet. As for his diet, I'd recommend going back to the Royal Canin. I'm not sure why you would switch foods, but it does seem like the new diet doesn't agree with his stomach, and unless you want to deal with a lot of farts, I'd put him back on a food that doesn't give him gas :-)

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    Answered By Lindsey Edwards MVB, BSc, IVCA

    Veterinarian

    Published on March 16th, 2017

    Gas build up can be very uncomfortable and can occur wither due to dietary sensitivities or due to undigested food fermenting in the bowel. A probiotic such as fortiflora and a gradual return to the original diet after 7-10days of gastrointestinal diet would be recommended. In severe cases a hydrolyzed diet such as royal canin hypoallergenic is required

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