Is there anything sadder than a guilty dog? Especially one that's just gotten his or her nose figuratively "rubbed in it?"

Here are some adorably pathetic dogs who don't even need to be disciplined because they've already punished themselves enough.

Source of guilt: stolen cookies

Source of guilt: chewed up a roll of tape

Source of guilt: stole his brother's bone

Source of guilt: who cares, with those adorable pouts?