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Why is my puppy lethargic with green diarrhea after eating cat food?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 2 months and 28 days old | 6 lbs

Puppy not feeling well having green mucus looking diarrhea. He has pooped 4 times like that. He is about 2.5-3months. He had Parvo before we adopted him. It was treated and when he felt better he was neutered and micro chipped (3days ago/wednesday). He got into the cats wet food twice yesterday. He has been sleeping/lethargic all day.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on December 29th, 2018

Getting into the cat's wet food could be the cause of Humphrey's diarrhea. I can give you a home remedy to see if that helps him. Withhold food for 6-8 hours, then feed a bland diet of boiled white meat chicken (no bones) and white rice in small amounts several times a day for a couple of days. Then slowly add back in his normal diet. If the diarrhea continues on the bland diet, he starts vomiting food, stops drinking water, starts vomiting water, or becomes very lethargic, he will need to see a vet right away. Best of luck.

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