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My dog with food allergies is itching again after a food switch. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 3 years and 10 months old | 70 lbs

My dog has been diagnosed with food allergies since he was a puppy. The vet told me which foods it probably would be and had me put him on Purina pro plan sensitive skin. It worked and he stopped itching, but a couple weeks ago he refused to eat his food and started having diarrhea, he would eat the other dogs food, but not his own. So we switched to blue and I made sure it didn’t have the possible things he could be allergic to in if, but he’s starting to itch again. What would you suggest i do

1 Answer

Most Helpful Answer

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Answered By Claudia Fioravanti

Veterinarian

Published on September 11th, 2019

Hi, I would either try to reintroduce Purina food gradually and if not tolerating it, source another hypoallergenic diet such as Hill’s Z/D for example. Have a look to see if wet food is available in the Purina range, there definitely is in the Hill’s one. If itchiness is severe and distressing, I would recommend to see your vet so he can dispense some medications to help promptly. Hope this helps and that things settle again soon.

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