Petmate シングルドア エクササイズペン

The double-latch door is a lifesaver—my escape-artist pup hasn't once figured out how to pop it open, even when he's zooming around after the cat. Folds up flat in seconds when I need the hallway back, too.

I set this up on the patio so my beagle can get some sun without me hovering, and she took to it right away. The double-latch door stays shut even when she throws herself at it, which was my biggest worry with a pen like this.

The double-latch door is the best part — my terrier can't nose it open like the old pen. I keep it in the living room and he gets his own little zone while I cook. Setup took maybe five minutes.