Ancol Training & Safety Variable Dog Whistle. The Ancol Variable Whistle is an important tool for any serious dog trainer. This whistle has a pitch that can be altered to suit both dog and trainer. Whistles are wonderful training tools for dogs for several reasons. Firstly whistles can be heard more clearly than the human voice particularly on windy days. Unlike the human voice the whistle will not convey panic frustration or weariness and so sends an unambiguous signal your dog will not struggle to understand.
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