Seresto Dog Collar for dogs over 8kg is for the treatment and prevention of tick, flea, biting lice infestation for up to 8 months on dogs over 8kg and over 7 weeks of age.
Seresto Dog Collar for Dogs under 8kg protects your dog from ticks & fleas for 32 weeks. Seresto Tick & Flea Dog collar contains imidacloprid and flumethrin for the control of ticks, fleas and biting/chewing lice on dogs over 7 weeks of age.