Feral; wild, untamed
I would say it isn't a wrong to take out an animal, any animal that is harming game be it a pack of dogs or a lone cat. or what-have-you
It would be another scenero if the animal is only killing to eat and stay alive but most animals that return to the wild and become feral kill to eat and also for the thrill of the stalk and the kill usually leaving the carcus to rot if the amimal that did the killing is not hungry. Just my opinion