Cannot ship to MassachusettsPrevents tick infestations within 48 hours after application. Re-infesting ticks are repelled and/or killed as quickly as 6 hours. It quickly kills fleas on pets within 24 hours and continues to prevent infestations for 8 months. Treatment with Seresto kills fleas and may reduce the risk of tapeworm infections (Dipylidium caninum) , bartonellosis (Bartonella vinsonii, Bartonella spp.) , and rickettsiosis (Rickettsia felis) , which are types of canine vector borne diseases) . No ...