Bio Spot SPOT ON Flea and Tick Control for Dogs help your pet stay away from the tick and flea. Six monthly treatments each Applicator kills and repels fleas, ticks and mosquitoes for up to 30 days Contains Insect Growth Regulator (IGR) to kill flea eggs and prevent reinfestationActive Ingredients: Permethrin, (S)-Methorprene, and Other IngredientsDO NOT USE ON CATS!