I purchased my first collapsible crate in 2013 for my malamute who chewed through plastic airplane kennel in hours. He bent and was able to escape the wire dog crates in a day. When I received my impact crate it was exactly what I needed! My malamute didn’t even try to escape it, he acutely loves it. Within days I would find him just sleeping in it with the door wide open. I have had a lot of dogs and have always crate trained them but I have never seen a dog take so well to a crate and just go sleep in it though out the day without me saying to anything. So after about a year I needed a bigger one so I purchased an xxl and gave the xl to my lab, she didn’t need one this heavy duty but I was hoping she would take to it like my Malamute. After about a week she loved it as well, I find them in there crates all the time though out the day. I don’t know what it is about these crates but dogs love them!!