So, I’m really concerned.

My pet, Jennavessia just got back from the resort. She was a Nostalgic Jollin... but now she’s a Common Experiment & I am very upset.

Did I do something to cause this? Is this a mistake? How can I fix this?

Did you happen to use the zapper?

Did you happen to use an item like on her? There's a handful of them and they all turn the pet into that particular experiment.

I'd file a ticket and have staff help you find out what happened. If it was truly a site mistake they will help fix it. If you did something and forgot they can tell you that too

Oh NO! I think I did!!! I wonder what I can do to fix this... I miss my Jollin!

You need + and take them both to Vanya, He'll tell you what you need to do. c: Also be sure she's your active pet.

No need to turn your pet into a Jollin beforehand, the instructions will automatically make her a Jollin.

There are some containers that when filled with Peka Glade water and FED to your pet will turn your pet into the Common Experiment , however, only some of them contain warnings in their descriptions. :/

Here are all the current items that turn your pet into that experiment, so you can avoid feeding them to your pet. :)

You're right. They must've changed the feed option to Use on x pet option or maybe my memory just isn't as good as it used to be because I bought all of them now and the feed option seems to be gone. I remember almost feeding a few of them to my main pet but then somehow found out it turned your pet into an experiment.

EDIT: Subetalodge even has notes saying "Notes: Obtained from filling an Empty Beer Bottle at Peka Glade This item does not count toward the Gourmand Achievement. Selecting the FEED option will turn your pet into Common Experiment ."

Yeah, it's quite possible they changed from feed to use on those, but I'm pretty confident that anything with a feed option currently is a food you can use for gourmand, and I can't think of any examples with both use + feed where the feed option isn't safe

Yes, I agree with you on that. And I like that they've changed that and the old/existing items they've turned into edibles.

But that's a discussion for another topic. :D I'm getting kind of off topic here. :P

EDIT: (Forgot to say that I like your avatar, here's a like from me. ^_^)