my dogs playfight with each other a lot!!!!
i play rough with them both, rottie occassionally gets over excited and jumps and play bites but it never really hurts (just the odd bruise)

ridgeback however, really nice and saft but his claws are always sharp (lots of scratches) and he has a problem knowing where the end of his nose is. unfortunatly this has lead to many hours of pain in the nose, teeth and general face area. hes worth it tho. you can sometimes get away with it if your quick enough. lol