Today, most K9 trainers understand the advantages of non-compulsive training methods for teaching aggression control.
Dr. Stephen A. Mackenzie has been a deputy sheriff for more than 20 years and has been training and handling police service dogs for more than 30 years. A popular seminar instructor, he has testified in both criminal and civil cases as a court-recognized expert in animal behaviour. He is currently a professor of animal science at the State University of New York at Cobleskill.