the playpen is great for when your home and able to watch them. Does he ever go potty in his playpen? if not you might be able to get away with leaving him in it while your gone for a few hours. If he does go in it if left alone then i'd crate him. The crate is not just for bed time. It can be used any time you can't watch them for a longer period of time. Its smaller and should prevent him from going potty in it.
when i was at work i crated my puppy the whole time (8 hours) and she did great. No pee or poop. then we went right outside when i got home.
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