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My puppy has loose stools transitioning to adult food. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Goldendoodle | Male | neutered | 11 months and 24 days old | 36 lbs

I started transitioning my dog from puppy to adult food (75% puppy, 25% adult) yesterday (Sunday). The puppy food is Iams Proactive Health Smart Puppy (chicken) and the adult is Iams PH Lamb & Rice. My dog has had looser stools as the day has gone on. Will eat pumpkin but not rice. Should I try to give him adult chicken food instead of a different protein? Should I feed him blandly for a day? I don’t know how much less adult food I can give him since it’s already only 1/4 cup.

1 Answer

Most Helpful Answer

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Answered By Lindsey Edwards MVB, BSc, IVCA

Veterinarian

Published on May 18th, 2020

Poor Murphy, he sounds very sensitive! Limiting change to the adult, chicken version may help if available and a probiotic paste can be very helpful for any diet transition. In sensitive pets, a 10% change every 3-5days can help reduce upsets. In large breed dogs, puppy food is ok up to 15months so there is no immediate hurry

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