Practice founders and brothers, Ira and Aaron McCauley, both graduated from University of Missouri veterinary school. After working at various veterinary clinics in Missouri, they acquired New Melle Animal Hospital in the Defiance, MO area in 2000. In 2001, sister clinic, McCauley Animal Clinic, was opened in Weldon Spring off Highway 94. New construction began March 2016, and the clinic is now relocated to 4646 Mid Rivers Mall Drive in Cottleville. Proudly serving clients in Cottleville, St. Peters, Weldon Spring, O'Fallon, Harvester, Wentzville, Chesterfield, and neighboring areas.