I don't know why I click into these threads, I really don't.
But I kind of have to ask ... do others in the historic section have these problems? I can honestly say I've never in 4+ years had any dog poo on my lawn. My office is in the back of the house so I miss a lot of the street goings-on, but I've also never seen a dog being allowed to pee in my yard.
There are owners walking their dogs at the Hilltop mail station (including a guy with a lovely Irish Setter who is perfection on a leash) but can't remember ever seeing piles o' poo there, either.