I hate it when people says "dogs are too good for us". We've selectively bred them for generations and in most cases chopped their balls off too. Of course when you come home your eugenics programme eunuch is pleased to see you. That's their purpose.
@anon_opin maybe they show affection out of fear for what happens next... guessing most other breeds have seen a Pug and gone "nope, not for me, I'm just gonna keep wagging my tail and stay out of the head-squishing process"