This is the face of a dog who wishes he could communicate that THE OTHER ONE PEED ON THE CARPET! And not him! But because he bore witness, he feels somehow implicated.
So funny these two ... when Flea does something bad, Reggie wears it allllll over his face like a big shit stain.
But Flea rarely shows this kind of "yeeps, someone's gonna get it". She'll go about her bidniz all lalalaaaa like she didn't just whiz on the rug.
Which she did in this case, by the way. What a beeyatch.