Why Fecal Testing Is a Must for Every Horse. And how our Wellness Program makes it simple. Routine fecal egg count testing is one of the most important (and most overlooked) parts of your horse’s preventive care. A proper fecal analysis helps us determine if your horse truly needs to be dewormed, prevents over-use of dewormers, and protects your horse from the long-term effects of parasite damage. At PHD Veterinary Services, we perform fecal exams in-house, which means you get fast and accurate