Description Seresto is an innovative collar that protects against parasites in your dog. Long-lasting: Seresto provides up to 8 months of protection against fleas, ticks and lice Repels and kills ticks, kills fleas and bites lice Indirectly reduces tick and flea transmission Risk of disease Optimal dosage of active ingredients thanks to innovative polymer matrix system Controlled drug release High user-friendliness - no more monthly applications Odorless Waterproof In the humble grey Ideally, collars should be used before flea or tick season begins.