Item Tag: 41-80 lbs

Other Ingredients. . 47.31% Frontline Shield for Dogs contains fipronil and the insect growth regulator (IGR) Pyriproxyben. Fipronil collects in the oils of the skin and hair follicles, and continues to be released from hair follicles onto the skin and coat, resulting in long-lasting activity against fleas, ticks and chewing lice.