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Is my cat's vomiting normal after switching back to prescription food?

Updated on September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered | 7 years and 3 months old | 17 lbs

My cat has been eating Hills z/d prescription hypoallergenic dry food for a few years now. The past few weeks have been hectic. We moved to a new apartment and I've had to work overtime, so when he ran out of his food, it took me a while to get to his vet to get more, so he's been eating regular wet food for about two weeks. I got his z/d and after about a day of eating it, he began vomiting small amounts of clear liquid and undigested food several times. Do I need to worry or is this normal?

1 Answer

Most Helpful Answer

Jenna Beyer, DVM, MBA, cVMA

Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on November 3rd, 2017

I would just continue to watch Dexter for a day or two. It is possible that the sudden switch in food (even if back to the prescription diet) has caused some irritation that should settle down quickly. If the vomiting lasts longer than 24 hours, or if Dexter has no interest in eating the z/d or seems lethargic, it would be best to have him checked out by your vet.
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