I'm sorry, brugrogrogrifilfil. CRF sucks. But at least there are some things you can do to keep them a little more comfortable and manage some of the symptoms as the disease progresses. They can still have some good quality of life even though it's hard to watch them and know what's happening.
My cat of six years was killed by a car. Her name was Little Big Baby of Love. The other night I pulled into the driveway. We live next to a busy road. Her sister was staring at a mangled thing by the sidewalk. I knew what it was before I even went to see. I buried her two feet down and made a tower of rocks over her head. Why am I telling this to strangers? I don't know either.
for a second my brain assumed you had cats sequentially and that you're at least 110 years old