Ah, I feel bad to do this to another brony, but you aren't allowed to upload content to deviantart that does not belong to you unless you have permission from the original artists. The problem with this is that the animation is usually made by a team, and so you would have to figure out who all worked on the screen and get written permission from every one of them. Although I'm sure they probably would give it to you, it might take a lot of work. Your better bet is to take it down and re-post it on a site where it doesn't violate the rules, like 'bronies' on memebase or maybe Equestria Daily solely (as I see it managed to get up there). I apologize if this causes you inconvience, but if you don't comply the admins will end up removing it anyways, and then you will also get in trouble, and since you are an actual artist I wouldn't want that to happen.
There are lots of pony-comics on deviantart - more than I can count. They don't get taken down. This is because this content wasn't made by the MLP staff, it was made by the artist. He used the franchise, but nothing else. If you want to find bundles of comics like this, go to the comic section of EquestriaDialy.