Well, as the title says, I can't seem to find a story. I don't know who the author is, nor the title, but I do know the key elements to the description.

In May the Best Pet Win, Rainbow Dash says "And that is why you'll never be my pet" to Twilight. So, Twilight turns into a pet to prove Rainbow wrong. However, now trapped in her form, she has to find some way to communicate to her friends what happened.

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