Little is known about the original recording behind this clip, but its appeal online comes from how instantly recognisable the stretched howl is. Shared on soundboards under searches like animals auuuuuuuuuu, it has become a shorthand for any pet or wild animal making a long, loud call. Creators reuse it in edits, reaction posts and short videos because the sound needs no context, it reads as funny, lonely or over the top depending on the picture placed over it, and that flexibility keeps it in circulation.