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If your dog has already been potty trained but has started peeing in the house again, or if you have a rehomed dog that is said to be potty trained already but has regressed, then patiently act as though this is the first time in this dog’s life that she is learning potty training. If
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Dawn Sylvia-Stasiewicz (Training the Best Dog Ever: A 5-Week Program Using the Power of Positive Reinforcement)