Advantage Blue Pack X Large Dogs is a powerful pet treatment product which:

Like most Advantage products, the Blue 4 Pack for X Large Dogs kills fleas not just when they bite, but also whenever they come into contact with this potent paralytic. As soon as fleas encounter the medication their nervous systems come under attack, leaving them immediately stunned and killing them only minutes later. This product is a must have for any owner with a dog over 25 kg (55 lbs.)