Available in 3, 6, or 12-packs, K9 Advantix II comes in convenient dosing packaging for dogs up to 10 pounds, dogs from 11-20 pounds, dogs from 21-55 pounds, and dogs over 55 pounds. If your pet is in between weight ranges, you can always start with the lower dose of K9 Advantix II; however, if effective pest control is not seen, then giving the higher dose is certainly safe in most pets. read more