Or at the very least keep it on a lead....
Apparently all dominant entire dogs cock their legs against people
This is news to me since my very dominant entire dog has never done this. In fact non of the male dogs I've owned have ever attempted this.
The guy just stood there and watched as his massive dog trotted over to me and proceeded to cock its leg. I caught on and tapped him in the side with my foot while saying no (may have also whacked the idiot in the head with a ball thrower when he didn't back the fuck off and went in for another go
). So yay me, I avoided getting peed on. I may have commented on the dogs rudeness to which his owner laughed, said it was just a phase and that he'd already marked 3 other people today 
It is not a phase you f'ing moron it is a direct result of your inabilities
keep the dirty sod on a lead or recall him when he tries to approach anyone, that if the bare f'ing minimum you should be doing. Honestly who the fuck thinks that is ok behaviour?