Our History Upon graduation from the University of Illinois College of Veterinary Medicine in 1964, Dr. Wayne Lutz founded Green Prairie Animal Clinic. Dr. Lutz began providing care to both small animal patients and large animal clients in the area, and it did not take long for the practice to take off. After his graduation from the University of Illinois in 1988, Dr. William Armbruster decided to return to the area and join his mentor and friend in the veterinary practice. Over the next several years, the business grew into the 3-plus-doctor practice it is today.