Seresto Flea and Tick Collar for CatsGive your cat long lasting protection against fleas and ticks with a Seresto Cat flea and tick collar. Unlike other flea and tick protection, Seresto Cat flea and tick collars kill and repel fleas and ticks for eight continuous months. Seresto Cat flea and tick collars are recommended by veterinarians, stocked by 8,000 vet clinics* and trusted* by pet owners for nearly a decade. Seresto Cat collars gets right to work killing existing fleas within 24