Quote Originally Posted by Glacier
Not all livestock dewormers get all kinds of worms. They have to be rotated to ensure all the different types are eleminated.

Pet dewormers(at least the good ones) get all the different types of worms at once so no need to rotate.
Actually, Glacier is right. Drontal Plus, which is the wormer my Vets use, treats all common canine/feline intestinal worms such as hookworms, roundworms, whipworms and tapeworms.