Every horse owner will have heard about the danger of worms. Without a comprehensive understanding, however, it is hard to understand the full impact a worm infestation can have on your horse. At Vet Medic, not only will our expert team inform you on the dangers of worms but also provide horse wormers and treatments from the leading brands, all available at a competitive price. The four most common types of intestinal worms are bloodworms, roundworms, tapeworms and bots. Worms are parasites. They live within and take nourishment from the horse, they cannot live without the host.