1. Strongyles: These are roundworms that live in the horse's digestive tract. There are many different types of strongyles, but they all can cause serious health problems, including anemia, colic, and death.
2. Ascarids: These are large roundworms that can be found in the horse's small intestine. They can cause weight loss, coughing, and diarrhea.
3. Bots: These are fly larvae that attach to the horse's stomach lining. They can cause ulcers, weight loss, and colic.
It's important to note that these are just a few examples, and there are many other parasites that can infect horses. It's important to talk to your veterinarian about the risks of parasites in your area and how to protect your horse.