Activyl is a potent and effective spot-on treatment used for controlling fleas in dogs and puppies. It not only eliminates adult fleas but prevents them from re-occurring as well. This waterproof treatment manages to kill adult fleas within 8 hours from its application as well as destroy flea larvae and flea eggs very effectively. It is a quick-drying formula that is extremely easy to administer on dogs and puppies. Moreover, Activyl is very safe for all dogs and puppies over the age of 8 weeks.