im a dog guy......got 2 of them on the couch next to me as i type this and a third one in the backyard working off breakfast.....i fully realize this is 100% on the owners head and i know of good pitbulls, my brother had one that was in my top 5 favorite dogs that i have ever been around.....
that said given the current laws do not let yah take a baseball bat to the idiot owner the dog needs to be put down as the owner has proven he cant handle the dog and unfortunatly it takes a ton of work to reverce this kinda behavior......as i said i dont fault any dog that protects his own turf, even if that means killing another......but i do not tolerate a dog that will bust through a fence to get to a dog in another yard....