PetLove Herbal Flea Repellent Collars do not contain insecticide. The herbal collar has been impregnated with natural oils, selected from natural herbs, with repellent properties. Non-toxic Pleasant smellParticularly suitable for animals that are sensitive to insecticidal flea treatments.The herbal extracts discourage fleas from inhabiting the dog. When using the collar it is recommended that the pets bedding and favourite sleeping areas are throughly cleaned to remove any flea larvae or eggs thereby reducing any risk of further infestation.The herbal collar does not contain and toxic products and is therefore totally safe to use.Collars should be replaced after 3 months.Both types adjustable to fit almost all dogs or cats.Directions for use:-Open the sealed sachet and fasten the collar around your pets neck. Posistion so that it is tight enough to have good contact with teh coat, but loose enough for a finger to be inserted between the collar and the neck. Cut off any surplus collar using scissors. If signs of irration occur, remove the collar immediately. Not recommended for puppies below 2 months old.