OK, that is one of the greatest dog/pizza pictures ever taken. You can definitely see he has something in mind there. As ThatsAmore correctly observed, with pizza that good looking at eye level, it's tough to say no, whether you are man or beast. Your dog is a well behaved fellow obviously, but there are limits to the veil of social grace that we all all put on over our more animal selves. Stevie Ray is saying "I'm a good boy, but I'm also hungry for some of that great pizza my master has whipped up. I know I might get in trouble for stealing this entire pizza, but boy would it taste great. Should I, or shouldn't I? That is the question..."