Re: I can't give my hamster its anti-aging treat
@slayer4evahI'll test it in my own game today and report back. There are a few open issues with rodents in Bug Reports but I haven't found one that matches this potential issue so far.
The ageing settings in the Game Options don't cover Rodents.
Can I ask what platform you are on? Is it PC/Mac or PlayStation/Xbox?
I'm exactly the same about losing pets. I got Cat's and Dogs after pet bereavements and my Avatar here is my tribute to my late dog. The first thing I noticed in C&D was the strays and it was like another trigger for me.
It's just a suggestion but you could also quietly delete that hamster and place another one for now when nobody is looking (don't tell your poor child I said that though lol).
Edit: I tested this in my game (on Xbox Series X with all packs) and once I'd ordered the treat on the computer I just needed to click the Rodent Habitat and mine looks like the image in my first post. The Sim with the treat in her inventory got the option to feed it to little Valentino the Hamster (See image). So if this doesn't work for you, let us know your platform and I know you said no mods but if you're on PC or Mac let us know if you're using any CC. Could you also attach an image of the options on your Rodent Habitat too so we can see if anything else is missing? I've seen reports of other missing interactions, like feeding or cleaning. Also make sure it wasn't placed with any cheats like move objects just to be sure.
You could also reinstall the My First Pet pack and see if that makes a difference.
My Sim loves her new Hamster!