I highly recommend an Aussie, but they are a little temperamental towards a lot of people they don't know. Almost every Aussie I've been around has growled, and been stand-offish towards other people, but incredibly loyal and protectant of their owners. Mine is like that as well. She is the biggest wimp in the world, but if someone comes to try to pat her, she growls at them. But I have had many people just go and pat her anyway and she just sinks into a little pile of wimpiness on the floor. But she is super smart, and very obedient, and I wouldn't trade her for anything!!