In general - we don't use a leash. We live on 3 ac - lots of room to run and explore.  Truth be told, I was aprehensive about not using a leash - but a leash is so restrictive and we wouldn't enjoy Bailey as much with it.   
Yes, the "come" comand is the #1 command. Bailey is very good at it.  Its the one command that she always gets a treat - ALWAYS.  If we don't take a leash outside, we take treats.   
As a back up - we also play "tag you're it".  Dogs love to chase - so bend over reach for the dog and say "tag you're it", then run the other direction.  Its a fun game.  Once the dog understands how it works - you can yell it across the yard, run the other direction and here she comes!  The reward is a few seconds of praise and play.     |