Yes, presumably the mitzva to help a jew is supposed to be a result of an emotion of wanting to help him. I can see little reason why that emotion would not apply to a goy.
Now, there are some people who it is a mitzva to shecht, like an oved avoda zara. So if you see an oved avoda zara needing help, I suppose you should conquer your feeling of wanting to help him, and if you can, shecht him.