NexGard Chewables for dogs 25.1 - 50 Kgs - 3 Pack. Administor Monthly. NexGard rapidly kills adult fleas and is indicated for the treatment and prevention of flea (Ctenocephalides spp.) infestations, for the control of newly acquired adult fleas and for the control of Paralysis ticks (lxodes holocyclus, Brown Dog ticks (Rhipicephalus sanguineus) and Bush ticks (Haemaphysalis longicornis) for one month. Lxodes holocyclus ticks do not occur in Westeran Australia. In tick season, daily searching for, and removal of, any ticks found is recommended. NexGard kills fleas by 8 hrs of administration. For use in puppies from 8 weeks of age. Not suitable for cats.