Back when we lived in Richmond our dear departed Bozo Kitty was sitting on our front steps, and probably thumbed his kitty nose at a passing pit bull being walked on the sidewalk in front of our house. Wise, he was not. 
Said pit bull broke free of his leash and proceeded to make mincemeat of Bozo. The pit bull got a few good scratches for his effort though, Bozo was quite the fighter himself.
After Lee tried to pull them apart
with no success (meanwhile the piece-of-sh!t owner screaming at Lee not to hurt her dog!!
), Lee ran into the house to grab a lead pipe with the full intent to bash the pit bull's brains in, but by the time he got back out the piece-of-sh!t owner and her vermin had run down the street and jumped into a car & sped off.
Needless to say, Lee was devastated, he and Boze were good buds. As was I, but I didn't have to live through the experience of watching our beloved pet being mauled on our front steps, and then have to load him up and speed him to the vet. Bozo's injuries were way too severe to keep him alive and suffering, so he had to be put to sleep. Even the vet was choked up - Bozo was a very beloved kitty.
So, I have zero tollerance for dog owners who can't, or are too lazy, to control their dogs.
And I used to loathe pit bulls on sight, until I met a friend's, which is one of the sweetest dogs imaginable.
2009 Lynskey R230 Houseblend - Brooks Team Pro
2007 Rivendell Bleriot - Rivet Pearl