Vicki, It's frustrating as heck but, some dogs are so rude to poop on others property and so are their owners.......
There are signs just for the occasion.....
http://www.signswithanattitude.com/n...igns_list.html
You can also make your own, it could say.....
" R.I.P.....Here lies Spike, cold and hard.....The last dog to s**t in our yard."