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Originally Posted by OwnedByJezebel

Sentinel treats heartworm, roundworm, whipworm, hookworm. Strongyloides, or threadworm, is considered a roundworm. The active ingredient in Sentinel is Ivermectin, which is the best treatment for this worm. You have good advice from your vet.

Worms, Threadworms (Strongyloides) Symptoms and Treatments in Dogs | Pet Health at Wiki-pet.com

I think Sentinel contains milbemycin oxime. It is not quite as effective as heartworm drugs containing ivermectin. Milbemycin oxime - Wikipedia, the free encyclopedia