for the record, it sounds like lestat has never had a dog... i could be wrong, but shitty advice (IMO) warrants that response.
if the puppy gets hurt, he will yelp... that yelp is a sign to the older pup to stop, and he will if he's playing.
you can tell if he's playing by body language. ass up, nose down = play
i have 2 dobermans and you would never know they were playing if you heard them. it sounds like a nasty dog fight and would freak a lot of people out, including me when i first got the second pup...
by the way, when i did get the 2nd he was 6 weeks old and around 10lbs... my female was 92 lbs and knocked the shit out of him... but if he ever yelped she backed off.
plus, your older male, through play is saying... i'm the alfa...
and biteme, you really are an idiot.