Zodiac FleaTrol Flea and Tick Collar for Large Dogs necks up to 25". 5 month protection.
Offers your dog over 12 weeks of age up to 5 months of protection from adult fleas and ticks. Continuous action begins the moment the collar is applied and continues even when wet. A variety of sizes ensure proper flea and tick control.
Measure circumference at base of dog's neck.
Active ingredient: Propoxur.