My female turned 2 in September and I noticed a difference in her as she got older. She is now completely aloof with strangers and doesn't bother with them on her own, but she does accept them petting her. Just today a lady that owns 4 GSD's approached and Robyn completely ignored her and pretty much avoided her. Also when my son came home from college he was waiting in the yard when she came out, he was more in the corner and had a hoodie on, she did run at him barking and growling with hackles up, he spoke up quickly and she recovered nice and quick and gave him lots of kisses. After seeing her do that I'm thinking she would do her best to protect, but since we aren't in these situations and its a slim chance we ever will be I will probably never know for sure.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD