I think he's gonna get in it eventually unless you fence it off... I'm almost done with my temp fencing that's been around the new lawn. That would do it. T posts at each corner and maybe a few of these other temp posts to stabilize it.
I'd put the fencing a few feet out from the edge of the garden so you've got room to work.
Doesn't matter if he's in it now, maybe he'll help dig :~D
Well...if I could borrow that, you're right, it'd probably work best.
So far he shows no inclination to help me dig when I'm digging...but he does like layin' down in the dirt. Or did yesterday afternoon when it was hot.