Dr. Dugan attended Southern Illinois University and received degrees in chemistry and mathematics (1982), graduated from the University of Illinois College of Veterinary Medicine (1986), completed an Internship in small animal medicine and surgery at Cornell University (1987) and completed a Residency and Masters program in comparative ophthalmology at Colorado State University (1990).

Dr. Dugan became a diplomate of the American College of Veterinary Ophthalmologists (ACVO) in 1990 and was an assistant professor of comparative ophthalmology at the University of Illinois prior to his decision to start a private practice in Denver and Colorado Springs (1992).

Dr. Dugan is currently the Secretary/Treasurer of the ACVO and has lectured on equine and companion animal ophthalmology at local, regional and international meetings. He has contributed original research, peer-reviewed journal articles and book chapters to the companion animal, equine, and exotic ophthalmic literature. In addition to the ACVO, Dr. Dugan is a member of the American Veterinary Medical Association, American Animal Hospital Association, American Society of Veterinary Ophthalmology, International Society of Veterinary Ophthalmology, Colorado Veterinary Medical Association, Denver Area Veterinary Medical Society, and the Colorado Springs Area Veterinary Medical Society.