I vividly remember me and my brother having a game on our computer that was a sort of pet care game but with nickelodeon characters back in maybe 2008-2010 (and no, it isn't the game Nickelodeon Pet Vet, too recent)
it had 3D graphics and I think it was one of those games with a free trial limit and loaded up a menu before running similarly to Toontown or Wizard101 but take those two things with a grain of salt. the only characters/pets I can recall being in the game were Gary from Spongebob, GIR from Invader Zim and Jimmy Neutron's dog but I know there was probably a few more. I can't remember everything in the game sadly since I was so young but the very few things I do remember was that you had the pet in a room that matched the show they came from (i.e if you had Gary then you were caring for them in Spongebob's house) and you could feed them and take them to this backyard/park area.
I just know this game has to exist since I strongly remember the game and recall me and my brother talking about it ages ago but I have never found it anywhere online or a person who knows what I'm talking about. But maybe my memory is just funny, I don't know. It'd mean a lot if someone could help me, thanks!