Sentry fireguard flea and tick spray for dogs controls infestations by killing fleas and ticks for at least 30 days. stops and prevents infestation of fleas and ticks (brown dog ticks, American dog ticks, lone star ticks and deer ticks (which may transmit lime disease)). apply sentry fireguard flea and tick spray for dogs to dogs and puppies (8 weeks or older) as follows. sentry fireguard flea and tick spray for dogs is not manufactured by or distributed by medial. frontline is a registered trademark of medial.