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Preventic is a tick prevention collar for dogs. It contains amitraz, an antiparasitic that works to paralyze tick mouth parts to prevent feeding and attachment. It provides 3 months (90 days) of protection and starts working within approximately 24 hours. The Preventic collar is water resistant and is available in 2 adjustable sizes: 18 inch for dogs up to 60 lbs and 25 inch for dogs over 60 lbs.