NexGard Chewable Tablets for Dogs (68mg) are formulated for dogs weighing between 10-25 kg. These chewable tablets provide monthly protection against fleas and ticks, with afoxolaner as the active ingredient. Afoxolaner works by disrupting the nervous system of fleas and ticks, effectively eliminating them. The 3-tablet pack provides a 3-month supply, with each tablet offering 30 days of protection.