in the 50's there was an act on at the sunday night at the london palladium who had this kind of act and that dog had a false bottom jaw,most people realized that
The talking dog was a variation on the old vent act. I suspect the man was "tweaking" something on the dogs undercarriage, to get the response. I hope he never tries that with my little Willy though !
I was also saddened to see so many people (audience and panel) appearing to enjoy it. That came as a bit of a surprise to me. For me, it was wrong on so many levels.