lilyflower, i've had very good result's using a product called;panacur 2.5,at the rate of 1ml per 10kg of bodyweight & using scolaban to treat tapeworm seperatley is the most effective method.try to worm every 6-8 week's routinely & you should have worm free dog's. remember to bath weekly to stop flea's from breeding & hatching egg's,( a cause of tape worm), & if in doubt about visit your vet for a blood & faeces check to determine the "amount" of worm's they have. see yah,daryl.