Something that is working for us is finding out where his favorite spots are and putting wee wee pads there. Then when he goes on them, he gets praise and when he doesn't he gets scolded. Then we leave it there for a little because if he smells it there he'll go there again. Then once in a while we'll move the pads around so he associates the praising with the pads, not the spot and we clean the spot under where the old pad was to get rid of lingering smells. Even if he goes right next to the pad, make sure you still scold him if its not on the pad directly.