please don't lock this for being a copy! it is not a copy!
you and your dog live in a world similar to i am legend, where a virus has transformed people into zombies. you and your dog got caught outside to late and now you're running away from a group of zombies who want to eat your flesh. your dog suddenly steps on bits of shattered glass (couldn't think of anything else) which slices his paw and keeps him from running. from here you have two choices, you can save your dog and hold off the zombies while he escapes, which would lead to your death. or, you can leave your dog behind and continue onward. but here's the thing, you've recently developed a cure to the virus. if you sacrifice yourself for your dog the cure is lost. if you sacrifice your dog, then obviously your dog is lost. remember that your dog has been your only faithful companion for years, years that would have been spent in solitaire if it weren't for him. if you have a dog or like dogs, you would understand the pain this kind of loss would being for the sake of the dog. so who will live? you or your dog? only one of you will survive...
Beyond the fact that I have far more respect for human life then the lives of other animals and plants,I've found that when you've experienced deeper forms of loss then a dog, when your next dog dies, it somehow just doesn't hurt very much at all.
that is not even a hard question... your feelings toward your dog or the cure to save human kind... duh i have a 4 year old american bull dog and i would morn his death but it would be "FOR THE GREATER GOOD" (any one know what that is from?) XD to have the cure