This is a huge annoyance, I recently added a ghost horse to a household I made for The Sims 4 Life And Death EP and when I dropped them on a residential lot the horse was alive and not a ghost so I w...
Ideas
Did you first make the horse a ghost horse in CAS as an elder or did you use cheats ?
No, I got the horse from the gallery and then I customized it with new traits and a new appearance.