sorry to hear your son got bit.....my coon dogs sometimes after hunting will fall asleep on back of the truck.I have seen them ,look like they are chasing something in there sleep ,even growling in there sleep,I have put my hands on the back of one of them and it agressively responded,however it didnt get me but my buddies dog had a fight on his hands for about 30 sec....I always make sure my dogs know it is me on approach....I appreciate the pic ....I showed my little boy who is 5 and told him this is what happens if you mess with the dogs when they are tired .

Let them walk ...and grow them big