Would recommend for small animals. Two critical issue: There is sorely lacking assembly instructions. I was inspired by the picture of the packaging. Not easy to climb. On the other hand, carabiners with chain that closes an opening on one side was broken net in the package. Too bad. I do not return the pen but I'm not 100% satisfied. This detail should have been replaced when checking the product. Otherwise the whole very good product safe. Fast delivery but I chose my home.