Each pack contains 3 Naxguard tablets - which together provide 3 months of complete protection against fleas and ticks. Unlike Barbacto, which is given to the dog every three months, Nexgard is given every month. There are those who prefer to do this every month, to avoid giving a large amount of pesticides to the dog for several months, but a smaller amount once a month. Nexgard is the first tablet to swallow that kills fleas and ticks of various types for a whole month. The tablet is also effective against Demodex mites, Sarcoptes mites and ear mites. The tablets are adapted to dogs according to weight. There are tablets for dogs by weight: 2-4, 4-10, 10-25 and 25-50. Make sure you purchase the tablet according to the weight of your dog!