The Four Faces Dogs Make When They're Really, Really HappyBelly rub? Bacon?! Whatever the reason, these content canines have plenty to smile about. Click here to see more pleased pets from I Can Has Cheezburger!

Credit: Icanhascheezburger.com

Updated: Tuesday Feb 19, 2013 | 06:00 AM EST

GOOD AS GOLD

Wait – is it possible to be more than 100 percent full?