Dr. Hagler graduated from the University of California, Davis School of Veterinary Medicine in 1985. He has practiced small animal medicine in the Lamorinda area for the past 28 years. Dr. Hagler is a Walnut Creek native and enjoys practicing veterinary medicine close to his hometown. He is a member of the American Veterinary Medical Association, California Veterinary Medical Association, Contra Costa County Veterinary Medical Association and the American Association of Feline Practitioners.

In his free time, Dr. Hagler enjoys spending time with his family in the great outdoors, and coaching sports in the local community.