Nope...never and can't imagine I ever will. It's kinda weird with my girl, I usually take her out through the garage to the backyard. She will run ahead to the door leading to the garage, I have to open it and step out first, then she will run ahead to the walkout door (even if it's open) she waits and I have to step out first. So, I can't imagine she would ever go out by herself
Now, if we are in the yard and I walk back into the garage for something, 15 seconds and she comes leaping through the door, LOL. I think she is a scaredy-cat
Seriously, we have a large backyard with split-rail wired fencing but I would still be afraid dog roam the neighborhood would jump the fence and attack her. Some breed can really jump...they may think my girl was prey or something. Ok, convinced myself...NEVER.