Grrrr.So frickin mad. The people two houses down let their stupid little dog out all the time in the front yard and it always comes into our yard to go to the bathroom. I saw it out there and was standing in the yard to shoo it away if it started doing anything (they were working on their car and not paying attention). The tiny dog wandered in the street right in front of a car and I hollered at it - the car stopped short and the dog turned back to me just in time. The owners thanked me, but I just walked inside, furious. It's not my dog!!!
As a kid, we had a neighbor that had a little poodle that they would just let loose to poop wherever it felt like, and often that was in our yard. My step-dad got so pissed that the one and only time he actually was able to get his hands on the dog, mid-poop, he drop-kicked it across the street.
At the time I thought it was really cruel of him, and not to say that I condone what he did, but as an adult I totally understand.