Growler's cat, Duffy, was diagnosed with CRF in 2007 and she has an excellent thread that you may want to look at. Here it is:
Thank you for the speedy reply
I've read Growler's posts and been on the other CRF sites, hence I got my cat on the wellness brand..thanks for that. My other cats are doing better on it
We checked the blood work, can't remember the numbers but I do remember they indicated Tus was in the early stages of CRF, Phosphorus levels were normal, but there was protein in her urine.
I don't understand why she continues to lose weight even though I feed her every 4 hours or so. She'll eat close to a tbls per feeding, sometimes more.
Mind you my other guys are loving it, so much so that they are getting a tad fat