Kill flea and tick effectively, unique formula for quick & long - lasting protection from flea and ticks. Natural botanic essential oil added. Instructions : 1. Adjust collar for proper fit so that two fingers can fit comfortably between the collar and your pet's neck. Cut off and dispose of any excess length. 2. Replace the collar every four months or effectiveness diminishes. 3. When collar is worn, observe neck area and remove collar immediately should signs of skin irritation occur. 4. Remove the collar when animal is wet or bathed and replace when dry. Caution : keep out reach of children. Wash hands after handling the collar. Hazards to humans and animal. Do not open until ready to use. It is normal that dust will form on collar during storage. Keep eyes or mouth away from dust. Harmful if swallowed. Collar is intended for external use only. Not to be taken internally. Consult a veterinarian before using this product on debilitated, aged, pregnant, medicated, or nursing animals. Pets under 12 weeks of age is avoided to use the collar.