Fuuck. I didn't even know that is a thing with animals. Sorry to hear that. With mine it was brain tumors. Confirmed with my other cat (his name was Brain, ironically).
And Pinky had the exact same symptoms, and she was still fit as a fiddle a year ago, so I think I won the lottery and had two brain tumors there.
Felt like shit too because you can see their personality just withering away slowly.
Cancer is a fucking bitch.
