I'd keep them separate. Have read of too many story of the "pitbull pack dogs" attacking people.
"Better safe than sorry" is the best proverb of the day.
As for human aggression, that is a no-no with this breed. Then again, blues are not American (pit) Bull Terriers, IMO.
Question: why not just one dog?
As for growling, that is a sign of fear and is a threat display. But caution is needed, as if your dogs act the pack, one will follow the other.
I'm no "professional" dog trainer, and personally do not tolerate it in a dog for any reason, so I'll let others help you in that area.
Just saw the "bit" part. I follow catchrcall on this one. I'd put it down. That was a warning for you if you can read it.
It is with our judgments, as with our watches; no two go just alike, yet each believes his own.
Last edited by Goemon; 02-03-2014 at 10:04 PM.