The reasons why cats with folded ears have bad breath:

1. The cat may be infected with calicivirus. When a cat is infected with calicivirus, there will be symptoms of oral ulcers, which will cause the cat to have bad breath.

2. The cat may be suffering from stomatitis. Stomatitis in cats can also cause gum pain. Cats are reluctant to eat on their own. Bacteria multiply in the mouth and cause bad breath.

3. The cat may be suffering from digestive tract disease. When a cat has constipation, diarrhea, or eats indigestible food that causes flatulence, food accumulation, etc., the smell of fermented food in the intestines and stomach will also be emitted through the mouth.

4. The cat may be suffering from diabetes. When a cat suffers from diabetes and reaches the stage of ketosis, the mouth will smell like rotten apple.

5. The cat may be lacking vitamins. When a cat’s body lacks vitamin B, it will affect the cat’s digestion and absorption, lead to oral diseases, and cause bad breath.