The reasons why dogs have bad breath:

1. Most dogs have bad breath due to poor oral hygiene. The owner neglects the oral health of the pet dog and fails to develop a regular schedule. The habit of brushing your dog’s teeth. Especially for pet dogs who often eat meat, the food residue left between the teeth will rot and ferment, causing bad breath in pet dogs.

2. Dogs often eat food with peculiar smell. For example, dogs often eat garbage, dogs suffering from pica often eat their own feces, etc. The odor of food remaining in the dog's mouth can also cause bad breath in dogs.

3. If a dog often eats food eaten by humans, it will also have bad breath, because the food eaten by humans has a lot of seasonings and is heavy in oil and salt, which cannot be digested and absorbed by dogs. , which will burden the dog’s liver, kidneys and gastrointestinal tract, and cause bad breath.

4. When a dog’s body lacks vitamin B, it will lead to indigestion, oral diseases, and bad breath.

5. When a dog suffers from diabetes and reaches the stage of ketosis, the mouth will smell like rotten apples. The owner must take the dog for treatment in time to eliminate the symptoms.