Peppermint Flea & Tick Spot On repels bugs and is an added layer of protection against fleas and ticks up to 1 month, and mosquitoes up to 1 week. Each box contains 3 tubes, a 3-month supply. One strength for large dogs (over 75 lbs). Active issue? Spot On doesn't kill bugs. Use Flea & Tick sprays for pets, home, and yard as directed.