Vet's Best Anti-Flea Easy Spray Flea Shampoo Pets VET'S BEST ANTI-FLEA SPRAY SHAMPOO kills fleas by contact without harsh chemicals, but rather with certified natural essential oils and plant-based ingredients, such as peppermint oil and eugenol (from clove plants). SAFE TO USE for dogs and puppies 12 weeks or older when used as directed. Can be applied indoors or outdoors. CLEANSES AND DEODORIZES dog's coat. Quick and easy to apply. MADE IN THE USA and proven effective. For natural flea and tick protection on cats, try our new Vet's Best line for cats.