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Why is my dog suddenly sleepy, lethargic, and not acting himself?

Updated On September 23rd, 2025

Pet's info: Dog | Miniature Pinscher | Female | spayed | 7 years and 1 month old | 11 lbs

hello my dog suddenly changed his behavior became sleepy and without no mood ..it’s not the dog i know the last 24 hours what could it be?it hasn’t got any health history

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on February 11th, 2019

Lethargy is a very general sign of illness, and it could be caused by systemic illness, infection, inflammation, or injury. I would take Grace into a vet today for a health check. I hope this helps!

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