Glad you asked that, I was about to ask the same question. We're planning to get one, just don't know all the right things to look for. We put lattice around our deck, so the boys could go and come there as they please. We don't have a fence so they're always on a leash when they go outside. I'm in Louisiana and in the summer we have misquotes as big as my yorkies, so we gotta try to keep them out of the house. Right now I jus leave the door cracked for them. Any suggestions on good ones, please let me know.