What is the etiquette in an off leash dog park? My 4yr old GS is very social and a big bundle of playfulness. However he is also still being trained and so "Come" is not in his vocabulary. When we go to the off leash dog park he'll usually trot away and up to all the other dogs. This does cause a bit of an issue from time to time.  
  
He isn't aware how much bigger he is than some of the smaller dogs, and of course there is the occasional owner who doesn't really understand how dogs play.  
  
It has got me thinking though - if my dog won't come anywhere close to 70% of the time when called - what's the etiquette? Should I not be letting him off the leash until he's fully trained?  
  
To be clear he is always 100% playful and never gotten his nose out of joint. 