We always keep the dogs on tie-outs if they're joining us in the front yard; they like to watch us do gardening, wash the cars, whatever. And we've had bad experiences too with loose dogs running up and scaring the living daylights out of them! Aargh!
Why don't these neighborhood lazies find a nice dogpark to let their dogs loose in, or create one in their area, instead of letting the animals menace others? Dogparks are growing in popularity, they're safe (often double-fenced at entrances and exits), and they give dogs the much-needed opportunity to socialize and free play! Here in California we're lucky to have so many nice ones, with pooper bags, water fountains, and very good dogs and owners. Kobie and Eli love the dogpark: just putting on shoes and saying "park" around here gets them howling with pleasure! It's the only off-leash option for us.
Here's a neat info site on Canadian and US dogparks, with tips on creating one:
www.dogpark.com/dpark.html