NexGard Chewables for Dogs 10.1 - 25 Kg - 3 Pack. Administor Montlhy. 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 (Haemaphysalis longicornis) for one month. Ixodes holocyclus ticks do not occur in Western Australia. In tick season, daily searching for, and removal of, any ticks found is recommended. NexGard kills fleas by 8 hrs of administgration. Foe use in puppies from 8 weeks of age. Not suitable for cats.