Ok This is my Second model edit..
Alright, i Changed an Epic Wolf Mount.. The PvP Mount.. [Horn of the Frostwolf Howler] That work's for me.. It works with [Horn of the Swift Timber Wolf] also.
Screenshot:
Put the patch-4.MPQ into your World of warcraft > Data folder. doesn't require any programs to be able to use this edit.
Link: patch-4.MPQ