Kills fleas, ticks. Kills fleas for up to 14 days. Kills ticks for 4 days on dogs. Kills the ticks that may carry Lyme Disease. Important Consumer Information: Purpose: Sergeant's Silver Flea and Tick Spray for dogs is specially formulated to kill fleas on your pet for up to 14 days, and will kill ticks for 4 days on dogs. Made in USA.