I'm sure it also depends on the individual dog. Mine is a sweetie. I have to be careful not to speak too harshly to him if he is naughty or he will get his feelings hurt and sulk for hours.

Actually, he's a Toy Manchester Terrier. He gets mistaken for a Min-Pin all the time. They look a lot alike except that mine has a tail and he's more shaped like an Italian Greyhound. I should get around to posting some more picutres sometime.