Doesn't look too happy!

Our daughter, Julia, is home and she took this one of Jonty. I thought his face was dirty then realised it's his paws, he's doing a Foxy lying like that.
Julia had been playing with him, throwing a ball down the stairs and he would fly down, pick it up and bring it back to be thrown down again. He loves it but I'm sure he's going to do himself an injury one day running down as fast as he does.
Not sure why he's looking so grumpy in this photo, maybe he want's to play some more or maybe he's just totally wacked out!