Worming puppies is recommended from two weeks of age, it is good practice to worm the bitch at the same time as you worm her puppies. Worming should be repeated at 5, 8 and 12 weeks of age after this the puppies should be wormed every three months. Worming liquids are convenient but not suitable for dogs under 1lb bodyweight. Panacur Paste for puppies is recommended for these lighter puppies.