How do you know they're not playing while you're out? Do you separate them?
From one dog to the next (our first golden taught the next golden puppy, taught the next golden puppy, etc) when we leave the house the dogs go to their assigned spots and sleep.
One funny memory I have with Danny and Sammy was when we snuck back in the house a few minutes after we left, we found the dogs had gone their different ways. One was sleeping under a desk, and the other had crawled into the bottom of our pantry to sleep (that was puppy Danny).
With Jacks and Bertie, I will shut them both in my room for brief periods of time (up to 2 hours - like when we go to church or that period of time between when I leave for work and the rest of the house wakes up), and Jacks will go to sleep and Bertie will copy him. When I come back in the room, Jacks is usually on my bed and Bertie's under it.
If that imprinting process wasn't there, then I would definitely seperate the dogs when I'm not home.
I've wondered about roughhousing myself. There are two boxers at the dog park who are great friends of Tucker's. They do the roughest play I've ever seen. It sounds terrible but it has never escalated. But I have wondered on occasion if I should be allowing Tucker to participate. And at home, with Bella, they do a lot of bitey face. But it's always Golden style play and while fast and furious never seems too rough.
I think what you posted in another thread is very true as far as different breeds having different play styles. With goldens there is a lot of wrestling, bitey face, leg chewing.... <- Jacks will actually have Bertie's whole head in his mouth
Which if I were a new owner probably would REALLY freak me out. Same thing if an unknown dog were doing that to mine. <- Why I would never take my dog to a dog park, ever.