My German Shepherd Norwegian Elkhound mix
He's very protective - if he don't know you then you're not getting into the house.
He is very hyper and if he knows you, as soon as you walk into the house, you got a 100 pound dog jumping up and licking your face. He did bite one person when they were in our yard but he didn't hurt him too bad.
He also has a very high prey drive. We live by a river and I will let him go for a swim and chase the ducks. One time he brought back a ground hog.