These people, they get away with such brutality and think they can run roughshod over everybody. Someday they're going to try this crap with somebody who has the proper training and skills and kill his dog and then they will find that there are other people in the world who can and will retaliate and they are to be feared for good reason.
Like Marcus Luttrell, the famed Navy SEAL. His dog was brutally killed for kicks by a couple of psycho hillbillies. He pursued them and was in contact with law enforcement the whole way who begged him not to kill them so they could make an arrest. But what do you think that SEAL would do if a cop killed his dog then bragged that there was nothing he (Luttrell) could do?
Short answer-don't mess with Marcus.