I recommend at least two whistles if you have a partner or someone else you walk your dog with then you can blow the whistles back and forth when out training. Get your friend, family member or partner to move 100 yards away then get them to blow the whistle to get the dog to come to them. Treat and praise then you blow the whistle to get the dog to come back. A great way to instill whistle training into any dog.
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