My girls can still be pretty naughty at 21 months. They've got tons of toys but love to chew anything that's not a toy (especially wood...
). So, I keep everything off the floor and the edge of the coffee table, lots of walks and they go to doggie daycare 1-2 times a week. I keep them in an x-pen when I'm not home as they inevitably find something I didn't think of.
We also use reusable potty pads; they're just adult bed liners. The breeder had them using these and the one time I put down a normal potty pad Monroe did a number on it (at 5-6 months) so I didn't try it again.
He'll get better though! I'm hoping someday I can trust mine completely! haha.