Johnsons small animal fly strike protector helps to protect against fly strike it helps to keep pets free from flies and also kills fleas lice etc rabbits and guinea pigs can often be bothered by flies especially in the summer months blowflies e g bluebottles are attracted to soiled moist areas and can lay their eggs on the fur near or under the tail causing very serious health problems therefore it is important to check rabbits and guinea pgs regularly and keep their hutch clean