I have a big old yellow lab. Probabley around 80-90 pounds (haven't checked for a while, and he is still growing!!!) He is extremely hard headed, but extremely loyal, and will not let a "suspicious character" get close! lol. Great around kids, and (most) people. I have never seen such a protective dog of kids either... Some people have mentioned wandering, I have never had this problem. We have a big ol' fenced in section of the yard/trees, and then about 2 acres of yard and what not and then 3 neighbors touching our property. We can let him out of the pen and go inside, and he'll just go lay out on the grass, or goof around on our property. Never have to worry about him running off.