The dog clearly had a false lower mouth which then begs the question, does it mean that by fixing it on and not to reveal the way the act is done, the dog has to have it's mouth fixed closed so that it doesn't open it its real mouth at the same time the false one is used? If that is the case then it seems rather cruel to me. If you notice at the beginning of the clip where the owner is talking in the waiting area, the dog has its real mouth open with its tongue poking out...so you can tell the 'talking' part is definitely false.