My Young sims and pet ghosts just turned human.

Thanks...I'll test that out...if it works...I will post here to let you folks know if it worked.

(edit)...I tested it using MC Command...aging up is still there, but the option for traits is not in the MC command center for animals that I could find in any of the options...MC's CAS is really limited to changing clothing only...I couldn't even change colors of fur.  MC updated the mod recently.

I found the solution though, thanks to you...see below.

Thanks Creeper...it was all about the age of the pet.

The solution was to age up the animal to elder and use the cheat codes below

1st, turn on testing cheats by entering" "testingcheats true" or "testingcheats on"

Then you need the pets ID number...you get that by typing:

"sims.get_sim_id_by_name DogorCatsFirstName DogorCatsLastName"

That will give you "your animals" character id number (they are unique, so don't use what you see in my screenshots)

Then you can equip the trait of being a ghost by using this code:

"traits.equip_trait ghost_oldage IDnumber"    (My pets ID number was 19 numerical characters long) 

Hit enter and the pet will turn into a ghost and still be in your family.  My family of 13 was preserved.  You can see in the screenshots, that the dog is a ghost and still in the household on the bottom bar 

@Nuke615Glad to hear and see. No Problem. Happy to help 🙂

a weird thing i encountered is before the update i made a household with a ghost dog and a ghost horse, the dog stays dead as an adult, i got these animals off the gallery as ghosts, the the horse revives when i load the lot and because in the last save state she was in my entryway of my staired foundationed house mind you, she gets stuck inside. i don't get why both of them are not reverting just the one whos more inconvenient, like elder horses cant do as much, or so i've been told, so i want the ghost horse to stay an adult. was i told wrong and i can just remake her as an elder ghost in cas?

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@EA_Cade wrote:

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@crinrict wrote:
@Creeper545548Might be design as you can only make elder pets ghosts now (as death by old age seems the only option for them).

Same with infants/toddlers. They don't have a valid death anymore.

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This is correct, what you're seeing is considered by design. 

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The problem is, an adult-stage ghost pet (Captain Whitaker) and child ghosts using a now-invalid death type (the ones spawned by the wishing well) existed in the vanilla game long before this. This change didn't just needlessly* limit what players can do, it accidentally broke things that were already in the game.

(* Mostly needlessly- I understand EA probably isn't cool with killing off infants and toddlers.)