aww you're making me want to cry! This is a lot like what happened to freddie, my cat. she had cancer and we didnt want to do surgery. she was laid to rest in 2005.
I'm so sad it might end that way with Tia.

Tia's got lots of hugs, nuzzles, and licks coming from my end of the computer!

I'm so sorry this is happening to you and Tia.