Alright, I have the official answer to this matter.

I just saw the new Batman movie. He's twice taken down by Rottweilers. First time, one managed to both bite through the armored Batsuit and take a good chunk out his arm.

Second time, he's taken down by three Rottweilers. Batman manages to beat the tar out of one of them. The other two almost have him for dinner.

Anyone crazy enough to think they're going to successfully break a Rottweiler or Pitbull's neck, send me some of what you're smoking.

No doubt, some special forces guy somewhere has done it once upon a time, after years of training, and he probably got lucky at that. But my thinking is if Batman can't do it, you can't either.