UFO – Unidentified Floof Object (floofinition) – Material belonging to or on an animal that isn’t recognizable and must be treated with caution until categorized.
In use: “Something was on the hall floor. Look like a clump. Could be bark carried in by one of the cats. Or it could be a UFO. Warily she approached. It needed to be picked up, but she wasn’t going to risk that with her bare hands. No sir, when it came to UFOs, it was better to use toilet paper or paper towel, in case it’s a floofberry.”