On the other hand, our kids have a black Scotty named Rex, and he's like a big dog in a little dog's body. Our half lab/half Komondors are more gentle than he is. LOL
Terriers come with plenty of attitude that is for certain. In our house we are big dog fans - my bulldog mix at 65 pounds is considered a “little” dog :-)
I think big dogs are actually more laidback. They know they are big and have the physical confidence to let things ride. Smaller dogs tend to feel the need to assert themselves.