Most times what people consider protection training is actual bite work training and the control of the dog during this process. The ability to turn the dog on/off in threatening situations. Teach the dog to bark…get yourself in front of a dog doing a bark and hold, it’s quite the test of one’s bravery. It’s also mostly in regards to the sport of Schutzhund or another bite sport. So not “true” protection per say…but with the right dog, I wouldn’t test the abilities.
There was a very long thread about “will an untrained dog protect me” with a bunch of people talking about their dogs reacting in a situation like the one you described. Others, who have done the training will tell you not to put your life in the hands of a dog that hasn’t been trained or at least tested to see if it has what it takes to face down a human.
I’ll assume that if this is a pet…you’ll be teaching it to not mouth, not touch people with its mouth. This is contradictory to what you want a dog to do in a threat situation. So if eventually you expect your dog to defend you, or your campus, you’ll have to teach it that there are situations in which that other response is acceptable.
This is all also greatly influenced by the dog’s natural drives/abilities/nerves. Without seeing your dog’s disposition, seeing it react in certain situations, it’s very hard to tell what it would do.