A dogs' "guilty look" is just your imagination.

Aw, poor innocent puppy pups. From BBC:

That "guilty look" on a dog's face is all in the imagination of the human owner, suggests research.

Dog owners have often claimed they can read the expressions of their pets - particularly that tell-tale look when they have done something wrong.

But researchers at a New York college tricked owners into thinking innocent pets had misbehaved - with the owners still claiming to see this guilty look.

The study found that the expression had no relation to the dogs' behaviour.

And researchers found that pet owners' belief that they could read their dogs' "body language" was often entirely unfounded.