Dogs crappin' in your your yard and attacking you/yours are two very different subjects BUT, with a common response from several members that is unsettling. Why do so many want to punish, make sick, attack, shoot, kill the poor dog? The dog is just being a dog! He/she is just doing what it's owner has either trained it to do or allowed It to do.
Why not feed the owner bacon grease covered dog crap, beat him with a bat, spray him with mace, shoot him with paint balls, etc? Well, because you will lose this battle in many ways.
If any of you actually practiced what you would "threaten" to do, you would most likely end up in jail and sued straight into poverty or, if the dogs owner is really crazy worse than that.
Let the local authorities handle it. Put them on notice, in writing, of what has been happening and make them make it the problem of the owner to correct what has happened.
My 2 cents worth.