Scalibor Dog Collars controls the infestations of ticks, mosquitoes and flies for up to 6 months. It also has some activity against fleas and is used in some countries as a flea collar.The Scalibor Dog Collar should be fixed around your dogs neck to control ticks (Ixodes ricinus; Rhipicephalus sanguineus) for 5 to 6 months, sand flies (Phlebotomus perniciosus) for a period of 5 to 6 months and mosquitoes of the species Culex pipiens for 6 months.The 65 cm collar is to be used on large dogs. Fasten around the neck only, one collar per dog. For external use only. Can be used during pregnancy and lactation.Scalibor collar for large dogs contains 4.0% deltamethrin which corresponds to 1.0 g deltamethrin per collar.