bro i know it sounds harsh, but keep in mind that I'm a qualified zookeeper so I love animals... all kind of animals.
Its war plain and simple, and I know it sounds super stupid, but the dog running away on two legs was kinda funny... the unfunny part is of course that the Gi's shoot the dog at the end (at least they ask each other if they should) but than again... does a dog like this has any chance of survival? So it was maybe the human thing to do and shoot it.