Just couldn't see it at first but after coming back to it half a dozen times eventually it became clear. I almost gave up.
The dogs nose is one eye. It looks more like a child with chocolate smeared around it's mouth than a clown to me. Left of the nose/eye the white bit of the dog's muzzle is the child's nose.
It's a tricky one! Look for a grimacing clown child with a large forehead and big mop of hair. It helps to look from a distance and out of the corner of your eye. Their posture is somewhat along these lines: