Effective against fipronil-resistant strains of fleas. Can be used in breeding, pregnant and lactating dogs. Kills pre-existing and new infestations of paralysis ticks (Ixodes holocyclus) for 6 months. Provides effective control of fleas on dogs within 8 hours of administration and subsequently maintains persistent efficacy against flea re-infestations for 6 months following application. The flea life cycle can be broken by the rapid onset of action and the long-lasting efficacy against adult fleas on the dog. Newly emerged adult fleas on a dog are killed before viable eggs are produced. Effectively controls environmental flea population in areas to which the dog has access.