I hate to be the party pooper (pun intended) and before anyone

actually schits on this guy's lawn, throws it over his fence, smears it on his doorknob or generally behaves WORSE than he has already....how about you approach him and tell him you noticed his dog had pooped right next to the entrance of your condo and even though its on the other side of the bushes, it is smelly and would he please clean up after his own pet? If he comes off with an attitude, I'd just tell him, "Well, I'm sorry you feel that way, I'll take it up with the Homeowner's Association, but you can be assured I'm NOT simply going to accept this and we can take it as far as you want to go with it".
Personally I think this is a lot more reasonable than all the other juvenile BS.
By the way; so the guy's an idiot and mentioned you had a lot of stuff. So what? I never read your original thread on that so if it was more than just commenting on your "stuff" I am off base here. But if he's just an insensitive idiot that spews anything that comes to his socalled mind, who cares about his comments? Why would you post here that its "on"? What? You're gonna go "knock his block off"? Get a grip man, you're a grown up....to the degree any of us here are