I like this a lot (probably because I'm a sucker for adorable rabbits and also because I thought 'door-defying rabbit' was cute and funny), but it doesn't currently work. If you upped the humor element, it could make a good joke SCP. If you added some creepy element (or some other element that I haven't thought of), it might work as a regular SCP… maybe.
Even if was something along the lines of preventing mammals exposed to it for too long from voluntarily entering doorways … or altering the nature of doorways exposed to it… etc. (Note: I couldn't say if those ideas would be enough to make this different enough from 524 for everyone's comfort, though it would probably work for me.)
Either way, cut down on the test logs, unless you use it to make a joke about the Foundation thoroughly testing something so silly.
P.S. To clarify, this needs something extra so it's significant enough to be a full SCP and not just an anomalous item with an entry on the anomalous items list of 'rabbit that can't go through open doors, but can go through closed doors'.