My dog was defined as "Pitbull type" that's why she must wear a muzzle in public in UK. I had to try 8 muzzles, but nothing was exactly for her. Then I came across the Frodogtrainers site. With many required measurements and different styles I finally felt that I would get right one. Now she has a wire muzzle that fits perfectly and gives her freedom to breathe, drink and get treats. We are very delighted.