A leash can be used to stimulate a dog's brain and let them know you're the boss. Learn about using leashes to instill leadership roles and balance a dog's behavior in thisfree pet training video. Expert: Mark Siebel Contact: www.DoggieStepsDogTraining.com Bio: Mark Siebel has owned Doggie Steps Dog Training for four years and has worked with over 4000 dogs. He teaches about health and nutrition for a new dog, general obedience, and behavioral adaptation. Filmmaker: Dustin Daniels