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Even if you only teach your dog to sit reliably on command, they will have learned some very valuable manners. Every dog owner has a responsibility to teach their companion some basic obedience commands so they can be courteous canines.
You will make four quantum leaps in training as you phase out hand-held training lures, and eventually all training rewards. If you fail to take these steps, you will end up with a dog that only behaves when you have food to lure it with.