You could always write about an animal related injustice (ie animal testing, abattoirs, dairy industry, pounds, even a neglected pet - but make the story out to be from the view point of a person until the last paragraph, talking in first person, if done properly those are always really effective pieces.
Ah yes, that would work really well. My stories are never that good, but I might
try see if I could pull it off.
I was actually thinking about writing from the point of view of an animal in a factory farm, and make it seem like its a person in jail. But I gave up, I found it hard to think of a good story line that would work :/