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My dog has bad breath, is eating less, and losing weight. Why?

Updated On September 23rd, 2025

Pet's info: Dog | Miniature Schnauzer | Female | 12 lbs

My dog is losing weight and her breath smells like infection. Just like when a human has infection. She also seems to be mildly lethargic. She is eating OK maybe little less than usual.

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1 Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on April 11th, 2018

Poor Layz! If her breath smells terrible and is eating less than usual, I would suspect that she may have a dental problem. Dogs need regular dental care just like humans, and if they don't get it, they can develop severe gingivitis, a tooth root abscess, or a rotten tooth among other conditions. She would be eating less because it's painful for her to eat. I would give your vet a call today to set up an appointment for her. The vet can examine her mouth, and if they feel that there is a dental problem, will want to do a dental scaling, cleaning, and polishing. It's best for her health to have this checked out as soon as possible, as dental problems that are left untreated can lead to further health problems such as abscesses on the liver and heart infections. Best of luck!

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