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Why is my senior dog coughing blood and sleeping a lot?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | neutered | 15 years and 9 months old | 75 lbs

My dog has been clearing his throat loudly since last night and he just coughed and a tiny bit of bloody mucous came out. He's also been sleeping a lot since yesterday.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on May 21st, 2017

Oh no, poor Marble! It is concerning that he coughed out some blood mucous and while that can be a sign of respiratory infection, in a senior dog I would also be concerned that it could be a sign of cancer. It's best that he is seen by a vet tomorrow for a physical exam, blood tests, urinalysis, and chest x-rays. These tests will help the vet diagnose what is causing his symptoms. Once a diagnosis is reached, the vet can discuss what treatment options are available for Marble.

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