Make your dog’s health and comfort a priority with the long-lasting protection of the Seresto large dog flea and tick collar. Unlike other flea and tick protection, Seresto large dog flea and tick collars are vet-recommended, stocked by 8,000 vet clinics,* and have been used by pet owners for years to successfully kill and repel fleas and ticks for 8 continuous months. Seresto large dog collars make your dog’s comfort a priority by killing fleas and ticks through contact, so pests don’t have to bite your dog to die. Seresto large dog collars are for dogs at least 7 weeks old. Seresto is a trademark of Elanco or its affiliates. * Elanco Animal Health, data on file