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Why is my dog lethargic, not eating, and acting very docile?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 7 years and 5 months old

My 65# mixed breed border collie male neutered has become very docile. Tail is down between his legs, no energy, won’t play or run, appetite very low. Is drinking normal water and peeing.

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on January 30th, 2019

Thanks for using Petco Pet Education Center, formerly Petcoach! Loss of appetite and lethargy can be observed with many conditions such as gastroenteritis, dietary indiscretion, kidney disease, pancreatitis, among many other possibilities. I recommend that you have Dexter evaluated by your veterinarian for further assessment and treatment. They would be able to check for these possibilities and others depending on the findings on exam. Treatment would be based on findings. Good luck and have a great day! Hoping for a speedy recovery!

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