Seresto Flea & Tick Dog Collars provide up to 8 months of continuous protection against fleas, ticks, and lice. The odorless, non-greasy collar releases a protective gas barrier around your dog's head and neck, creating a zone of protection without messy topical treatments. Safe for dogs 7 weeks and older, Seresto collars are water-resistant and won't interfere with other flea and tick products. Keep your furry friend comfortable and protected all season long with this veterinarian-recommended solution.