This head halter has a better fit in my opinion than the more well known head halters. Using this halter as a tool while out in public and on walks with your dog will reduce dog/dog leash aggression, and will not let your dog "practice" pulling. You can go for a pleasant walk with your dog, so you BOTH can get much needed exercise. As with any other "tool", this is not a substitue for training your dog to walk nicely on leash.
I've posted a video of Melissa putting the New Trix on Sydney after Pre-Agility Class....