I half expect him to have a pen in his mouth. Or keys. Something he's just made off with, and is taking back to the hoard. (And...I have no idea why I think he's pet-sized, as opposed to much, much larger.)
The facial expression also reminds me of my cat, the last time I tried to give him a bath: caught between disgusted and bewildered by my stupidity. (Maybe that's why I automatically think he's smaller. H'm....)