PREVENTIC Collars: Tick collar for dogs containing 9% amitraz to kill and detach ticks for up to 90 days. Do not use on puppies under 12 weeks of age. Do not use on cats. Provides full protection against ticks within 48 hours of placement.1 Stops new ticks from attaching.Makes it less likely for dogs to get tick-borne diseases. By killing and detaching ticks, PREVENTIC® Tick Collar can reduce the risk for transmission of Lyme disease, babesiosis, and rickettsia.