What do you mean by provoked? What does it take for your dogs to bite? Do they have to be cornered? Teased? Poked? Prodded? Are they fear biters? Would they bite a person who is dominating them?
I'm almost 99% sure that 2 of my dogs would never bite. They have very sweet dispositions and love every human and animal that they come into contact with. Then there's the third dog who already bit. I knew that he had it in him and I wasn't surprised. But I wouldn't be very surprised if one of the other 2 bit. I know them very well, but they haven't seen everything. I don't know how they'd react in any given circumstance. I guess they typically are predictable, but I will admit that I don't know my dogs well enough to predict their every move.