He just wanted to say "hi" to some passerbys. Who happened to be dogs.
Jack was not on a leash and wouldn't listen to John as he called to Jack to come back. But being the sweet and friendly guy he is, he went up to the two dogs to say hi to them and was immediately attacked and bitten. An ugly fight ensued and then stopped as quickly as it had started. I'm not sure how the other guy looks, but this is how my little sweetie looks. He's getting stitches tomorrow to close the gaping wound in his arm. He's taking antibiotics and limping and not complaining.