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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.

3 Answers

Most Helpful Answer

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!

1Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Ricardo Fernandez, DVM
Veterinarian, Veterinary Oncology Resident
Published on February 4th, 2018
Thanks for using Petco Pet Education Center, formerly Petcoach! Loss of appetite and lethargy can be observed with many conditions such as gastroenteritis, systemic infection, dietary indiscretion, kidney disease, pancreatitis, among many other possibilities. I recommend that you have Buckley 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!
1Pet Parents found this answer helpful
Answered By Ricardo Fernandez, DVM
Veterinarian, Veterinary Oncology Resident
Published on June 30th, 2019
Thanks for using Petco Pet Education Center, formerly Petcoach! Lethargy and loss of appetite can be observed with many conditions such as gastroenteritis, dietary indiscretion, kidney disease, pancreatitis, among many other possibilities. I recommend that you have him 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!
1Pet Parents found this answer helpful

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