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Was it perhaps an entry in the Petz series?
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No, it looked exactly like Nintendogs, same graphics and everything. As realistic as possible, identical menus, even identical minigames (like the Opera singing one). There was also a "cleaning the litterbox" thing.
Edited by Lermis Space Battles Dot Com fanworks (unnoficial) index in my Sandbox.
You might be thinking of Purr Pals! (I'm sorry, I'm unsure of how to post a link but a quick Google search should help you find it. I had that game too!)
That's it!
Space Battles Dot Com fanworks (unnoficial) index in my Sandbox.
I distinctly remember a version of Nintendogs that was about cats on the DS. Before you say "Nintendogs + cats", I distinctly remember that my friend and I played this game when I was in elementary school, before 2013, and that it was definitely a nintendo ds game. It was also a European release. I'm pretty sure it had a different catriadge (did I spell that right?) from the classic Nintendogs, but I'm not too sure. However, searching for it on Google only brings the 3ds game result. Surely I'm not hallucinating?
SOLVED: It's Purr Pals.
Edited by Lermis