Washes fleas away. For over 25 years Vetâ€™s Best has blended natural ingredients that work together to comfort and protect your pet. This unique blend of Peppermint Oil and Clove Oil Extract was carefully formulated to kill fleas, by contact, naturally and safely. Our luscious shampoo effectively kills fleas and flea eggs. This freshly scented bath also gently cleans the coat and calms flea-bitten skin.