Seems like an increase in horses being attacked by various types of dogs. I recently read of mules down south in desperate need of homes due to being turned out by people who not longer needed them(were used to guard livestock). I could be wrong, but maybe if those who own horses get a female mule(I guess they are more docile than the males) to guard their horses there would be less of a problem as mules hate dogs and will defend themselves with hoofs and teeth.
http://www.jokeroo.com/videos/animal/pit-bull-violently-attacks-a-horse-who-bites-back.html
"If there are no dogs in heaven, then when I die I want to go where they went"~Will Rogers
