I've looked into it a bit awhile back. I read the chicken wire but mine is not in mulch really its in the yard.I've also heard burying their own poo in it to defer them or cayenne pepper.I've used the penny can before with other dogs i've owned.. Didn't even think about that. I've never seen him dig when I was out there. But yesterday was gorgeous so we where out there for a long time and he started to I said NO and he stopped and looked at me like what? I potty I run I dig out here you don't want me to dig? He doesn't like getting in trouble so I think the penny can might work well. Not for in the house problems though haha he pees when he gets scared

Thanks for all the advice guys! I'm sure he'll grow out of it he's a good puppy!
It's not a major problem just something I don't really like him doing haha. I've only found 4 holes so far.