Bundle includes 12 single-use tubes that each repel fleas and ticks up to 1 month. A year’s worth of added protection. Powered by nature and proven to work, Spot On comes in 1 strength for cats and 3 for dogs: small (under 35 lbs), medium (35-75 lbs), large (over 75 lbs). Fresh peppermint scent. Active issue? Collar doesn't kill bugs. Use Flea & Tick sprays for pets, home and yard as directed.