Many guys here are missing the point.
It is not about picking the man or the dog (I'd probably pick the dog and ask for a help for the human), but at least showing some respect for the dog.
He could at least tell someone about the dog, even if he was refused from the rescue team, he still tried. But in this case, he didn't. He just left it there, assuming that the dog would die anyway.
Now imagine not saving a life just because you are assuming something wrong.
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