Dogs are naturally clean animals: given a choice, they will urinate and defecate away from their sleeping and eating areas. However, it is not obvious to dogs that carpets and floors are inappropriate elimination sites. They must by systematically taught to discriminate indoors vs. outdoors and to exclusively use the latter. The key to housetraining is getting a history of rewarded trials in the desired area.
Decide where the doggie bathroom is going to be and go there regularly: first thing in the morning, last thing before bed, shortly after meals, when he comes out of his crate and, in the case of a puppy, every hour or so.
Illness can cause a trained dog to regress as can a change in routine. A sudden diet change often causes diarrhea that the dog can’t control. Many dogs do not generalize their housetraining to all indoor locations. This plus the stress of adapting to a new home may cause a trained dog to make mistakes in new surroundings. New owners must supervise closely to interrupt on time, and provide extra opportunities, with rewards, for newly adopted dogs to use their new bathroom areas.
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