K9 Advantix II is a spot-on treatment for dogs that helps prevent and control flea and tick infestations. This specific product is designed for extra-large dogs weighing over 55 lbs. The pack contains a 4-month supply of the medicine. The brand name is Advantix and the EPA registration number is 11556-143. It is suitable for pet dogs and the model name is K-9 Advantix II.