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Why is my dog lethargic, won't eat, and has diarrhea after new food?

Updated On September 23rd, 2025

Pet's info: Dog | Boston Terrier | Male | neutered | 28 lbs

3 year old Boston Terrier Indoor dog We are pet sitting for our sin Was fine in every way until potty time He would try to poop with no results This went on for a day Asked son and he said to give canned food Gave Purina Naturals The gas was awful but he was pooping great Now has diarrhea Stopped canned food He was feeling great Now he is lethargic, won't eat and has diarrhea for 1 day so far

1 Answer

Most Helpful Answer

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Answered By David Elbeze, DVM, MRCVS

Veterinarian

Published on December 28th, 2016

withhold food for 12 hours then offer him boiled boneless chicken and rice every 6 hours in small portions. if he is eating and not vomiting, continue with this diet for 2 days. After 2 days, you can put him back gradually on his normal food. If the diarrhea and lethargy continues, take him to the vet to get treatment.

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