I need some advice on wormers. My vet has prescribed Panacur for the furrkids worming treatment, but I've heard this brand only kills roundworm, whereas Drontal kills both roundworm as well as tapeworm. Does anyone know if this is correct? I don't understand what the point is of having a wormer that treats only one kind, so maybe the information I have is not correct? Since it's difficult to spot worms, I'd rather have something that does it all. Any thoughts would be appreciated.