Invest in a flea collar for dogs that actually works! Try the Zodiac Flea & Tick Collar for Large Dogs & Puppies with necks up to 15 inches. This flea killer for dogs repels those nasty pests from Fido's life - for 7 months! Easy to use, this flea control for dogs is worth it. Flea control for dogs starts working on contact Water resistant flea collar for dogs Flea killer for dogs provides 7 months of protection For large breeds/puppies 70 lb+ Made in USA