FRONTLINE SPRAY controls fleas and ticks, and can be used on kittens from 2 days of age. Below you'll find all the info you need to decide whether this product is right for your pet. Your vet can also advise whether FRONTLINE SPRAY is most suited to your pet's needs. When you use FRONTLINE, the active ingredients are rapidly distributed through your dog's coat. In addition, FRONTLINE is completely waterproof.