I bought this product and it arrived in just two weeks! It suits my GSD and Malinois cross ideally after I filled his sizes. The dog can bark freely being muzzled and can’t take it off. I trust 100% that the muzzle won't slip down as compared with the other muzzles I had before. It has many holes for free breathing and the muzzle allows a mouth opening and barking - this is immensely useful for agitation training. I paid extra for a quick-release buckle, which is much more comfortable to take on and off the muzzle, especially when the dog is excited after training. Thanks again and I will purchase from you in future.