Canworm suspension is a Fenbendazole 100 mg syrup, belongs to a class of drugs known as anthelmintics. This drug is often used to remove various gastrointestinal parasites from dogs and cats. Canworm is effective against roundworms, hookworms, whipworms, certain tapeworms and parasites called strongyles and strongyloides.It is also effective against certain parasites of the bronchial tree and lungs (aelurostrongylus and paragonimiasis).