VetGuard Plus For Dogs XLarge over 66 LBS 4 Month Supply For dogs over 66 lbs and over 12 weeks of age Compare to Frontline Plus, PetArmor Plus and K9 Advantix II Quality flea and tick protection for your dog without a prescription. DO NOT USE ON CATS - MAY BE FATAL EPA Reg. No. 67505-3-88966. EPA Est. No. 088969-IN-001