If you are female, do you feel safer when walking with your dog than walking alone? Would your dog protect you if you were attacked?
Or is the other way around, and you're worried someone will try to snatch your dog when you are out?
My dog would definitely try to protect me, but probably by doing a lot of jumping around and barking because he's nervy rather than a natural guard dog. He's an elderly mutt so I don't worry about his safety.