Vet's Best Flea Itch Relief Shampoo. This fast-acting shampoo is veterinarian formulated with a key blend of natural ingredients and essential oils. It includes micronized oatmeal, solvent-free orange and lemon peel oil and neem oil. This itch-relief shampoo for dogs is designed to immediately calm and moisturize red, raw and irritated skin from flea bites or infestations. It is made in the USA, paw-fect for dogs 12 weeks or older and will not affect topical flea and tick treatments.