There are many worm and parasite natural remedies that will kill them in difference stages. That is of the utmost importants, one parasite formula I use is in tincture form, it contains the green hulls of black walnuts, wormwood, cloves and quassia these herbs attack all stages of parasites, I have used this on myself and my dogs, these remedies have been around for hundreds if not thousands of years. Animals and birds have relied on bentonite clay or (mud) for thousands of years to remove poisons from their systems. Modern medicine or should I say pharmaceutical companies are still in the experimental stage with some very negative side affects. I have traveled Asia and other countries and realize nobody is immune to them humans and animals even here in the U.S. the main thing is to keep them under control and keep them from polluting our blood and becoming toxic, which leads to illnesses. Parasites and worms are moon creatures, which detach from our bodies seven days before a full moon this is when they go into reproduction mode and this is the best time to start a cleansing. Remember if your animals have parasites and worms you do too. Once a month treatment with a rather harsh chemical in my opinion is not the way to treat an animal look for alternatives start from the beginning, do it on a regular basis (daily). I have personally felt the effects of parasites and have tried to keep them in check they are never going away but I manage them. If this is hogwash then be it I will continue to practice looking for healthy alternatives for my animals and myself. Remember this parasites and worms utilize our food we intake and leave us what they dont or cannot consume then they defecate in the host body poisoning the blood supply which then leads to illnesses and diseases.