Virbac Preventic Tick Collar, Kills & Detaches Ticks For 4 Months,Single Collar, 25"

PREVENTIC Tick Collar for Dogs starts working within 24 hours of application and continues working for as long as the collar is worn, up to 90 days.  The collar comes in 2 sizes; 18' adjustable collar for dogs up to 60 lbs and 25" adjustable collar for dogs over 60 lbs.

Do not use on puppies under 12 weeks of age.  Do not use on cats.