You don’t have to be Perry Mason to get a confession out of a dog. A guilty dog just can’t hide his guilt.
Now, they wouldn’t feel guilty, would they, if they didn’t realize something that they did was wrong. Scarfing Daddy’s pizza when Daddy gets up to answer the phone. Tearing up a roll of toilet paper. Dogs know these are no-nos, and yet they do it anyway. And then the conscience beats ’em up.
Almost human–except no dog has ever figured out how not to look guilty.