He was too busy eating the yellow jackets that were eating fallen peaches. Do all dogs like the taste of yellow jackets? And yes, they sting him as he's trying to eat them. He jerks his head back, sometimes two or even three times as he's trying to choke them down.
Yellow jackets must be really, really tasty.
He's been eating them for a few years now, and it's gotten to the point where if I see one on the ground, I'll call him over for a treat.