WHile I can't place a true instance he protected me like you are asking, I feel so safe with him there. Titan is well behaved off lead on our property so he literally goes everywhere for every reason with me.. trash, mail, yard work, car work, etc. That enough is a deterrant, I make it very known that he exists (just by simply allowing him to walk with me outside and play in the front yard), and he is well behaved. As someone said in the "getting a GSD for protection" thread, a well behaved dog seems more threatening than one going all over the place and he fits that bill. He watches people as they pass and alerts on the few that look too long at the house. I like that.
When we are inside the house he hears everything only barks if there is something there so I truly trust his instinct. This alone makes me feel so comfortable. I would never rely on him solely for protection, but he's a very good alarm system, ha! My husband and I have a few guns and our own training on protection, so together we are a good match
I will say that when he was a puppy and we lived in a remote village in Germany, I would walk with him and he was so friendly with every single person.. I mean he was just a baby! But there were 2 times he clearly wanted nothing to do with a particular individual and I trusted that. Once was a creepy man that I had seen in the neighborhood looking at my house a few times. One day he followed me and Titan to the hills behind our house and Titan would not let him near him. Growled at him and wouldn't turn his back to him. The guy laughed and I went home and locked all my doors writing a description of the man down. Another was who I then called the "witch lady" just the vibe I got was that, and Titan again wanted nothing to do with her, growling and wouldn't take his eyes off her. Well, she did then mumble something in German, really creeepy like and spit at me and called me a B**** so there's that... Could also be that she looked different but he had no issues with any other strange being or animal we made contact with, so I truly believe something was off about those two. He was only about 6 months and we never had an incident. There's only been one time in his whole life he's tore after someone and it never happen before that or after that so there's that too, not attack, no blodd drawn, just barking and a nip (story for another day or I can link the thread)
Anywho, I think if you have a well bred, stable dog, while I wouldn't rely on them for protecting when it came down to it, there is something to be said about feeling protected or feeling safe
