Replaces chewable flea and tick protection and conventional spot drops and collars. Powered by plants, this collar is safe and effective at repelling fleas and ticks for dogs and puppies over 4 months when used as directed. Enjoy peace of mind knowing your pets are protected. This collar is easy to cut-to-size for dogs and can be used on most pet sizes. Fits up to 21 neck. Natural essential oils make it a safe alternative to traditional spot drops and collars. Safe to use around kids when used as directed. Mom owned, Mom approved.