How does Seresto® work? Seresto® was developed using a mechanism of action: the active ingredients in Seresto® are released consistently and appropriately for up to 8 months, providing your dog with up to 8 months of protection against fleas and ticks and, in dogs, also reducing the risk of infection with Leishmania infantum. 8 reasons to choose Seresto® Dogs It can be applied to puppies from 7 weeks of age. Up to 8 months of protection Designed for the most adventurous dogs Eliminates fleas and ticks on contact, without the need for them to bite the dog. Protecting your dog can help protect your family Fragrance-free, so nothing stands in the way of pampering A worry-free app Composition (active ingredients) Collar for dogs ≤ 8 kg, 38 cm collar (12.5 g) contains 1.25 g of imidacloprid and 0.56 g of flumethrin. Collar for dogs > 8 kg, 70 cm collar (45 g) contains 4.5 g of imidacloprid and 2.03 g of flumethrin. size Available in two formats: Seresto® Dogs over 8 kg Seresto® Dogs - weight 8 kg