Help protect your canine companion from unwanted visitors with ShieldTec Plus Flea and Tick Treatment for Dogs. Specially designed for large dogs weighing between 34-66 pounds and puppies older than 12 weeks old, this topical solution offers premium protection from fleas, flea eggs, lice, mosquitoes and a variety of ticks like brown dog ticks, American dog ticks and deer ticks, including those that may carry Lyme disease. Permethrin helps repel adult fleas, ticks, mosquitoes and lice for up to four weeks while pyriproxyfen works as an insect growth regulator, killing eggs and larvae and helping to prevent new infestations. Every purchase comes with four treatments for four months of protection.