Long-lasting up to 2 months insect-repelling collar for outdoor, working, kennel dogs, mini horses, goats, other . Gives relief from pesky insects around eyes, ears, face and neck. Repels flies, fleas, mosquitoes, ticks, gnats. Snap on collar snugly, yet not too tight to cause skin irritation. Fits 21 -24 . Ingredients: Epa Exempt, All Natural Ingredients: Citronella, Cedar Oil, Geraniol, Lanolin, Glycerin Into Cork.