Fast-acting and long-lasting, SENTRY Fiproguard Plus is a squeeze-on formulated to protect your cat against dangerous pests. It stops the flea life cycle and kills flea eggs and larvae for up to 12 weeks Kills ticks that may transmit Lyme disease Waterproof For use on cats 8 weeks of age and older, 1.5 pounds and over Before you apply Applying correctly starts with purchasing correctly at the store. Before purchasing, weigh your pet. Don'T guess. It is important to know the exact weight - Hold the cat for a few seconds to give the solution time to be absorbed into his coat.