Bad Breath 
Bad Breath Halitosis (bad breath) is generally caused by two things: dental problems or poor digestion.
First, look in the mouth. The problem may be bad teeth or gums, cancer of the mouth, or bones stuck between teeth.
If the mouth isn’t the problem, look to the digestion. Give your pet digestive aids such as digestive enzymes, ginger snaps, or Chlorets. I use Chlorowin, made by Wintec Inc. (314-257-5400), a digestive aid with chlorophyll, mint, and liver for palatability. The product helps combat bad breath as well as odors during heat. Another good supplement is chlorella, available in health food stores.
Chlorowin: Follow label instructions.
If the teeth are clean, purchase pet digestive enzymes for your animal. The enzymes help the animal break down and absorb food. Green vegetables in the diet are also helpful. The veggies contain, among other things, lots of chlorophyll, a natural detoxifier. If halitosis persists, see a veterinarian. There may be a liver problem.
Peppermint oil, available in health food stores, has a minty scent and is antibacterial and anti-inflammatory. It will not cure periodontal disease (see section on dental health), but it will help with the breath. Other options for bad breath include natural toothpastes, baking soda, lemon juice, and finely ground rubbed sage.
Peppermint oil: Add a few drops of this or spearmint essential oil to a cup of distilled water and use as a mouth spray.
Bad breath, without dental disease, may mean you are looking at a problem of food that doesn’t agree with an animal. The immune cells in the mouth are overreacting to foodstuffs and you get a kind of “dermatitis of the mouth” and a bad smell. A red flare, or line, above the teeth, or even an entire oral cavity that appears inflamed, is a major sign that the problem is being caused by imbalances in the endocrine and immune system that often lead to food allergies and other disorders (see section on food allergies; also see chapter 16 on what to do when nothing seems to work).