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  Can you break or fold the x-pen down so all there is room for is his bed and food/water bowl?  That way the only place to go potty is out the doggy door and outside?  He will more than likely go potty out the doggy door since he is already familiar with this practice, since there will be little room in the x-pen to soil, other than his bed.  And I bet he will choose to potty outside vs his bed when he has the option.  |