Sergeants Squeeze-On for dogs kills fleas, ticks, mosquitos, flea eggs and flea larvae fast. It also controls flea reinfestation by preventing flea eggs and larvae from turning into biting adult fleas. This treatment contains Bitrex, a bittering agent, to reduce the chance of ingestion. Each application is effective for 30 days. Kills fleas, ticks, mosquitos, flea eggs and flea larvae Prevents reinfestation Contains bittering agent For dogs 33 lbs and under and 12 weeks of age or older 3 month supply