seresto flea and tick collar for dogs small under 18lbs (2-pack) seresto is seresto the right choice for your dog? outside dog? choose seresto. inside dog? choose seresto. worried about fleas and ticks? choose seresto. and if you dislike the inconvenience of applying monthly topicals, choose seresto. after all, just one collar every 8 months is more convenient to give than applying a monthly topical like frontline plus. for dogs that don’t like to take pills like bravecto, nexgard or comfortis — and owners who don’t like to administer them — seresto provides 8 continuous months of effective, flea and tick protection. even better? unlike monthly oral products, seresto does not require a prescription and doesn't require a bite for the fleas and ticks to die.