The active ingredient in Strongid is available over the counter in very safe wormers such as Nemex, Evict or others that contain Pyrantel Pamoate and it works on hook or round worms.
Its much safer than the other kinds of over the counter wormers.
A wormer that works on hookworms, roundworms and also whipworms that is fairly safe is Fenbendazole which comes from the vet as Panacur or over the counter as Safe-Guard however you really should have vet supervision using this in my opinion
http://www.petplace.com/drug-library/fenbendazole-panacur/page1.aspx
With a big worm infection the pup is likely to vomit some up and have abdominal pain as the worms thrash and die and she may see worms in the stool too. She just needs to be ready for the surprise reactions that go with killing a big worm infection.
Hope this helps you!
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