Peppermint Flea & Tick Collar repels bugs and is an added layer of protection against fleas and ticks for up to 4 months, mosquitoes up to 1 month. Use with Flea & Tick Pets + Home spray to protect your pet. One size for dogs (up to 21" neck) and cats (up to 13" neck) 4 months or older. Active issue? Collar doesn't kill bugs. Use Flea & Tick sprays for pets, home and yard as directed. Small/Medium Dog: Fits necks 9.5"–21", 3/8" wide. Wondercide is proven to work without the conventional ingredients. Our lineup of plant-powered sprays, spot ons, collars, and shampoos harness the power of nature to do the job. Lab-tested to protect your pet from fleas, ticks, and mosquitoes. Loved by people, pets, and pollinators. It’s all good Repels and prevents Fleas Ticks Mosquitoes Designed for Dogs ages 4+ months Cats ages 4+ months Alternative to Conventional flea-and-tick collars Highlights Lab tested and proven to work Repels fleas and ticks up to 4 months Repels mosquitoes up to 1 month Plant powered Fresh peppermint scent Made with steam-distilled natural essential oils Made without artificial colors, dyes, or fragrance Cruelty free Safe around the whole family when used as directed USA made with U.S. and global components