Those dogs are dangerous, and not only to the BG's.
If you noticed, in one of the scenes, the dog attacked the handler. Not good.
And, it took many seconds for the dogs in the last part to obey the orders of the handler.
Over trained to become killers instead of tools. How do you think that dog fighting and such has become so popular? Trained to kill, not to obey.
One of the reasons that they have a training schedule that has to be done with military dogs and why they won't try to create "super dogs", too many had to be put down while they were trying to find a training program for them.