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Why is my dog's poop smaller after switching to Royal Canin?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | unneutered | 1 year old | 55 lbs

Spock is on Royal Canin hypoallergenic for mild IBS and his poops are suddenly smaller in size/thinner, not string like, but definitely smaller and thinner than when he was just on kibble and bits. Is this normal? Should I be worried about a partial obstruction?

1 Answer

Most Helpful Answer

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Answered By Lauren Jones VMD

Veterinarian

Published on April 21st, 2017

Changing diets can certainly cause changes in stool appearance and size. The Royal Canin hypoallergenic diet is a higher quality diet than Kibbles and Bits, which typically results in less waste due to fewer filler ingredients. Higher quality diets often result in slightly smaller and less frequent stools. If Spock had an obstruction, I would expect profuse vomiting, anorexia and lethargy, so this sounds unlikely. As long as Spock is eating and active with no evidence of vomiting or diarrhea, it doesn't sound like there is cause for concern! :-)

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