[Maximo]

Having so many piddle pads around the house might be part of the problem. Too many targets, so he might think anywhere is fair game.

What kind of pads do you use?

I would definitely set the pen back up with the pad. When you can't supervise, put him in the pen. Even when you can supervise, I would limit his roaming area to the room where the pad is.

Be sure to praise him profusely when he goes in the right place. Get really excited like he just performed the best trick ever. Give him a kibble reward or some yummy little treat.

When he goes in the wrong place, do not show frustration. If he sees you upset, he may go to hide to potty.

Hope this helps. Hang in there!