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Why is my dog lethargic with brown nasal discharge and low appetite?

Updated on September 23, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 35 lbs

My dog is more lethargic than usual, BM normal, eating and drinking but appetite decreased. Today has brownish nasal discharge. No cough. Suggestions? Thank you!

1 Answer

Most Helpful Answer

Dr. Dayna, DVM, CVA

Answered By Dr. Dayna, DVM, CVA

Veterinarian, Certified Veterinary Acupuncturist

Published on April 5, 2018

I am so sorry to hear that Suzie isn’t feeling well. Anytime I see a dog with brownish nasal discharge I worry about a few things.
I have seen it be the first sign of aspiration pneumonia, even before coughing. I have seen it be irritation to the nasal passages from a vomiting event that went up into the nasal passages, and I have also seen it with canine distemper and other upper respiratory diseases. I would encourage you to have her evaluated by your veterinarian soon. You may want to check for a fever as well. A normal rectal temperature on a dog is up to 102. Monitor for any other symptoms such as nausea or cough. Best of luck and thank you for using Pet Coach.
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