Fly Strike Protector contains effective permethrin for long lasting protection for your pet. Fly Strike is a serious and sometimes fatal helath problem for rabbits and guinea pigs which Fly Strike Protector can help against. Spray Fly Strike Protector every 7 days during warm weather to deter flies and protect your pet. Although Fly Strike Protector can deter flies and protect against Fly Strike a hygienic and clean hutch and cage is a vital point to avoid attracting flies. Fly Strike Protector also kills fleas lice and other insect pests.