Rainbow Dash? Yes? What are you doing? Errm... Nothing! Nothing at all.
I have nothing really to say about this vector. Just looked through the latest episode and found this frame and thought, I need to vector this Some critique on Twilights hooves would be nice. I had to make them up because they weren't shown in the reference.
A slightly modified, but hilarious version can be found here: [link]
Applejack usually bit Rainbow Dash's tail though. (Although Rainbow Dash does bite Twilight's tail twice, first to keep her from falling off the cliff in the second episode, and then during the whole chain in A Dog and Pony Show)