We just had a 2 year old little boy wonder off with his jack Russel into the woods/fields in a rural area out side of St. Louis. The damn dog came home 2 hours later, alone. They found the boy (he was fine) in the middle of the night - searchers heard a bunch of coyotes and figured they were circling the boy and they were right!
Now, if that would have been a herd dog - that child would never have gotten out of the yard! And even so my Sparky (10 year old Pembroke Corgi) would have found him for me.
Corgis are awesome - I prefer Cardigans - they are like short GSDs with a sense of humor. :-)
Before the Border Collie we had a Pembroke. He kept our CHILDREN in the unfenced yard <|;>)
He was a bonehead, though, when it came to getting lost in the neighborhood. Whenever he disappeared we sent our Tabby (they slept together) out to get him - within an hour the cat would appear, smug as all get-out, with the dog in tow.
We also had an experience with a child who unlocked a door and followed the CAT out in diapers in dead-of-winter. We put an adult-height deadbolt lock on the door and got the Corgi. When he was "watching" the kids he stayed close, but when out alone he wandered.