Why would someone do this??

Earlier today, my family & I watched our neighbor across the street attempting to kill one of his dogs. He actually chased the animal around his yard, carrying a large stick with him, biut 3" in diameter and maybe 3 ft long. After he finally caught the dog, he proceeded to beat it with the pole & his fists, while pinning the animal on the ground. The nhe picked the dog up by the throat, strangling it& choking it. After that, he carried the dog by the throat over to where he had a partial truck bed for hauling & grabbed a rope (looked like a orange outdoor extension cord. He threw one of the rope over a tree brach & tied it around the dog's throat, then proceeded to hang the dog. Whe nthe dog would start screaming & gasping for air, he'd release it and then do it again. After doing this 3-4 times, he then dragged the dog to the backyard & tied it to another tree, but only giving very mittle give on te rope, cause it was again tied to a branch, thereby giving the animal very little freedom of movement. If the dog would try to pull, it would hang itself again.

I called the police several times, telling them to get out here & stop it, cause if they didn't, I would. I was not going to just stand there & watch that man torture that animal. How in the hell could people do this to an animal? It's now several hours later & I'm still fuming over this.