Submitted by Annie Berthold-Bond, Care2.com

Citrus peel extract is an excellent choice against fleas for dogs, because its components—d-limonene and linalool—kill all stages of the flea's life cycle. I have completely eradicated our home and dogs of fleas using citrus peel extract—I don’t think anything else works as well. Still, you must use caution: while it is a natural material, and much safer for health and the environment than toxic synthetic pesticides, it is not without problems, especially for asthmatics (see “Caution,” below). Citrus shouldn't be used around cats.

For Fleas from and on Dogs
Assuming you don’t own a cat, and you keep your windows open when using citrus peel extract products, get rid of fleas in your house by washing floors twice a week with a solution of 1/4 cup citrus peel extract (available in health food stores--citra solve is one brand) in 1 to 2 gallons of water. Spray bedding with a mixture of 2 teaspoons citrus peel extract and 2 cups of water in a spray bottle.

To make a fur rub for the dog, cut up 4 lemons, and simmer for one hour in 1 quart of water, adding more water as it evaporates. Cool the mixture, strain, and massage into the dog’s coat. Note that there are a number of pure citrus-peel-based pet products on the market