My three pups play rough together ALL the time. You'd think they were killing each other if you didn't know better. They make funny growly noises, tackle each other, bite at each others fur, steal toys then play keep away. If it gets TOO rough, I seperately take each one to their water dish since they're usually panting and tired at this point.. let them get a drink of water, then put one on the couch with me, give the other two a toy/treat to keep them occupied. They'll be calm for a few minutes but then start back up again
Silly dogs! I'm watching them MUCH more carefully now though when they start tugging on each others fur... someone ripped a patch of Bentley's hair out and it got a bit infected and he had to go in for a shot, antibiotics and cream..