A whistle produces a sound, the dog then needs to associate an action with that sound. A whistle has little advantage, from a training point of view, to the voice, both are foreign to a dogs usual ways of communicating.
A whistle has the advantage of disturbing less game than the voice and having, usually, a longer range. Apart from that it offers no real training advantage. Body language and hand signals, on the other hand (Pardon the pun) do.
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