The vet arrived around noon. All the horses received their shots and she did a ulcer test (fecal blood) on Jackson. It came back negative. She suggested that I do daily fecal checks on Jackson for 8 days so we can get a feel for his parasite rhythm. She suspects that he has a sensitive stomach and is more bothered by worms than the average equine. She said she had been trying to figure out why I was finding any parasites since we muck twice a day and the pasture is dry. She figured it must be the donkeys. They typically carry a heavier load than horses and commonly tote around tapeworms. Ewwww.