what are you teaching him or the lack of

This is just your kids way of demonstrating and marking his territory. That dog is his. End of story! lol

Let the dog handle this. The dog will show your kid who's boss when he bites his peniss off. Afterwards, your child will never aim at the dog again.

Come on. You're the boss. It doesn't become a routine thing unless you let it become one.

Your kid is showing the dog that he is the Alpha Male. Pee on your kid. You'll be showing him that you're the Alpha Female and he is your territory; he has to live by your rules. If he refuses... tell him to piss off. Get it? Piss off? See what I did there?

At least he's some what potty trained.

I know people that used to learn over the side of their deck and pee on whatever was below: pets, plants, a car, a bike, even people! And they did that until they were seven or eight.

WIN .

Just roll up a news paper and hit his noae while shoving his face in it..... He'll learn

I totally agree with 83. However, 31, in the case that your child is autistic, there is not much to do there. But I am assuming the OP's kid is not, as it was never implied. Like many others so far have said, a simple swat on the bum should do the trick. Unless you are not a consistent parent, then it doesn't mean much. I've never had a kid though so what do I know, right?