It's really strange, but I clearly recall Isaiah 11:6 stating that the LION shall lay down with the lamb. Wolf, to me, makes no sense whatsoever when one views the symbolism from a purely theological perspective. The wolf is portrayed as being evil (ex. "wolf in sheep's clothing"), whilst the lion is noble, and also represents the tribe of Judah. The lamb is, of course, Christ. Most people remember it as being "lion", not "wolf". It doesn't make any sense that in paradise the wolf will lie with the lamb, for that implies there will be a reconciliation between the forces of good and evil, but that's just absurd.