Why does it matter? Personally, when it comes to tricks, I much prefer that the dog responds to hand or body cues. Over time, I whittle most of them down so they're essentially imperceptible to observers. That way, people are even more amazed. ie: "wow! how are you even cuing the dog to ____?"
If you want to include verbal cues in the repertoire, that's up to you. Just start adding each verbal slightly before the respective signal while practicing, the dog will eventually begin to anticipate the forthcoming signal. Then simply drop the signal.
If you want to include verbal cues in the repertoire, that's up to you. Just start adding each verbal slightly before the respective signal while practicing, the dog will eventually begin to anticipate the forthcoming signal. Then simply drop the signal.