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My 4-month-old puppy has diarrhea, won't eat, and is lethargic. Vet?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | unneutered

Rex is only 4 months old he is utd on shots we got him from an animal shelter 2 weeks ago. Yesterday he started having diarrhea and he will not eat; he is drinking water but very lethargic dies notnhave fever. How long should I wait before I take him to a vet.

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on December 5th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! Diarrhea and inappetence can be observed with conditions such as colitis, gastroenteritis, dietary indiscretion, intestinal parasites, among many other possibilities. I recommend that you have Rex evaluated by your veterinarian at this time for further assessment and treatment. They may choose to check for parasites and to start medications for diarrhea depending on the results. Good luck! Hoping for a speedy recovery!

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