Pet Trex 24" Playpen fFr Dogs Things we love about the Pet Trex 24" Exercise Playpen For Dogs ($30)? It comes with eight adjustable panels, a secure double-latch door, and ground anchors and stabilizers. Plus, it's a steal at just $30. Image Source: amazon.com Pet Trex 24" Exercise Playpen For Dogs $30 from amazon.com Buy Now