Barnaby has a dog park friend, Tugg (as in Tugboat) the Great Pyrenees. They both weigh 120+ pounds and are a great match. I don't imagine costly vet bills when Barnaby slaps Tugg with his paws, or watch for a panicked expression to wash over his owner's face.
I only smile as I watch them slow motion wrestle and play until they are exhausted. (Unless a small dog with bells on runs by and then Barnaby will run huge circles until the offending creature has moved on. Barnaby is terrified of small dogs with bells.) I'm always happy to see Tugg and his parents at the dog park. It's important to have someone your own size to pick on at the dog park.