I voted yes and no.

Micki is very protective of me, to the point at attaking people and other dogs, but has gotten tons better. Mini and Jack really aren't, Kyra can be a bit protective of my mom, if she tries to hug somebody or something she will start growling.

Shadow is definately protective over the family, I trust her the most to protect me if I needed it. For example, it was summer vacation years back (I'm talking 5-6 years ago) and my parents were gone at work and all of us kids were in the living room. My Aunt came in, she didn't knock or anything and started to come towards the living room, Shadow would not let her near us and was snarling and growling, something she had never done before. As soon as we realized what was happening we told Shadow it was alright and that was that, she even knew my Aunt, its not like she had never seen her before.