Trying to train your dog to retrieve long distances can be next to impossible when training alone. A retrieving launcher simplifies the task.
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Puppies are capable of learning even at a young age. Start training early and make it part of the daily routine. The “come” whistle will come naturally.
Controlling the learning environment lessens the distractions for the puppy. So he concentrate on learning the retrieve.
Learn some methods to get those puppies retrieving early in life.