I like that the plastic muzzle has a piece you can slip down to prevent your dog eating...stuff...through the muzzle!
I had a dog that would get sick every spring, because she liked to eat whatever rotten stuff she could find that had been buried under the snow all winter. Didn't seem to matter how careful I was about cleaning the yard, she was always getting into something. With a regular wire basket muzzle, she could push the muzzle against what she'd found and it would ooze through the wire so she could eat it.
I solved the problem by cutting out a piece of plastic from a margarine container lid, and putting it in the muzzle at the very front. Seems like whoever made this muzzle must have owned a dog like mine!