Answer by  
                                                                                          smellycat22 (1129)
                                                            
                          
                          
                                                          You would train him just the same as a puppy.  Take him out as often as possible and when he goes outside give him lots of praise and/or treats.  Don't react if he does his business inside, just clean it up really well.  Your dog is probably still adjusting as well so he might pick up the habit slower.