Things You'll Need
Never use diluted Listerine on a dog that has very sensitive skin or is prone to allergic reactions. If the dog develops a rash, dry skin or any other condition, cease treatment immediately and go to the vet.
Original-formula Listerine works best for this treatment. Do not use Listerine that contains teeth-whitening ingredients or fluoride, as they can irritate the dog's skin.
When your dog gets fleas, you may hesitate to use a harsh pesticide treatment on him. For a more natural solution to your problem, try a mixture of Listerine mouthwash and water. The Listerine gets rid of fleas on the dog, and can also be used to kill fleas on the household spaces where they may have spread. The diluted Listerine is safe to use on a dog's skin because the water takes away some of the bite that could sting.
Fill the bathtub with warm water and bathe the dog with shampoo. Rinse the soap thoroughly from the dog's fur.
Fill the spray bottle halfway with Listerine and top it off with warm water. Spray the Listerine solution all over the dog's coat, making sure to apply an even layer. Avoid the dog's face, as the solution could sting his eyes.
Allow the Listerine solution to soak in for about five minutes, then rinse the dog completely. Comb through the dog's hair with a fine-toothed flea comb to remove dead insects.
Spray the Listerine solution on any surfaces the dog may have contaminated, such as his bed and stuffed toys. Spray the dry dog with the solution a few times a day, combing it through his fur to evenly distribute it.
Continue to treat the household items and the dog several times a day until all evidence of the fleas vanishes. Bathe the dog once a month, using the Listerine treatment, to keep fleas from returning.