Alot of bad advice on here. You don't kill a dog because it interupted your hunt. What did the dog look like? Was it all matted and filthy looking? You can usually tell what a feral dog looks like. Most the time they run in packs like yotes and wolves. I think you killed it out of anger. How do you know it was this dog? Kinda strange that if people seen that dog chasing cattle or lambs that they would just ignore it and the ranchers let it go. The ranchers didn't kill it? Very strange.