I bought this Gentle Leader for my Saint Bernard that I rescued in March. He has never had prior training and was always pulling on the leash! Obviously, because he's such a big dog, his pulling habbits had to stop. My trainer recommended a Gentle Leader, so I checked Amazon.com, of course, and they had exactly what I needed. This thing is definitely an attitude adjuster! When he's wearing the Gentle Leader, he tends to stick closer to me, and when he does decide to pull, he's quickly stopped by the Gentle Leader pulling him back to me.This thing is amazing! I recommend it to ANYONE with ANY pulling problem with their dog.