Why Does My Dog's Breath Smell So Bad?  5 Common Reasons And Explanations

Bad Choice Of Dog Food

Low-quality dog kibble is made of all kinds of scraps and food. Dead animals, roadkill, garbage, etc. are also beloved chew toys that cause stinky breath in dogs.

Periodontal Diseases

Most often, dogs suffer from tooth decay and tartar buildup. Dogs can also suffer from lots of gum diseases, including gingivitis, and redness and swelling of the gum line.

Liver Disease

Canine liver diseases are often characterized by vomiting yellow bile and a loss of appetite which cause the dog's breath to smell bad.

Kidney Disease

When dogs exhibit urine smell from their mouth, then this is a sign that something’s wrong with the dog’s kidneys!


Dogs that suffer from diabetes have elevated ketone levels in their bodies which makes their breath smell bad.