Hi! My guys are not aggressive at all. They are very proctective though. I think every animal has certain "traits" but always have their own little personalities and often I have seen then act like "one people dog". They are very smart and will work people to their benifit. Being a little dog, I think they have a big attitude. I just love them. And we all know, the older we get, the crankier we are!!! HA!