Hi, my name is Carol.  I got my first boxer over 50 years ago.  Her name was Duchess.  She was the smartest, funniest dogs I've ever had.  My family home was in city limits, but it had not been populated yet.  So, we were comfortable letting her stay in the back yard during the day.  Most of the time someone was home with her and going in and out.  She also had Boston Terriors to play with.
 
One day however, we weren't home, she decided it was time to eat.  She jumped the fence went down to the neighbors (about 1/2 block), scratched at the front door.  The lady let her in. Duchess went to the kitchen, sat down and looked at her.  So the neighbor feed her.  Then Duchess, went back to the front door, again looked at the lady.  She let the dog out, who returned home, jumped back over the fence and was sitting there waiting for us when we got home.  We would never have known, if the neighbor hadn't called the next day. 

Have only had two boxers since then, because of my past spouse.  I now have a 14 year old female and a 3 year old male.