Advantage Red For Large Dogs 22-55 lbs (10-25kg) - No Rx requiredAdvantage Red For Large Dogs (4 Pack) Flea prevention and flea and biting lice treatment. Kills fleas and biting lice on dogs One treatment prevents further flea infestation for four weeks Can use as a part of a treatment strategy for the control of allergy dernatitis Dog Size : below 22 lbs & over 55 lbs (10 25kg) Method of Administration : Topical. Part the hair on the back of the neck at the base of the cats skull until the skin is visible. Place