ifonly Humphrey was diagnosed recently with advanced Stage 4 CKD, as was his FIV (it all came at once
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I make my own raw food for him, so I did some swapping around to low phosphorus meats - 90% chicken thighs and hearts, 5% lamb kidney, 5% chicken liver, and a teaspoon of ground eggshell per kilo of meat and some fish oil. Then, before feeding, I replace 10% or so of the mix with cooked egg white (all protein, no phosphorus), and add some water and kefir as a probiotic. I'm going to start adding some B vitamins too.
I could go on and on about him, but we need to keep his stress levels low because of the FIV, and because he hates the vet, sometimes when we bring him home it takes him two days to settle down again. He was eating, but that started to decline, and it has become apparent that he has excess stomach acid (he was clearly hungry, and would come running to his bowl, but then give it two licks and walk away) so we've started giving him slippery elm bark (miracle supplement by the way!) and within hours his appetite returned! Sometimes he needs a little encouragement such as warming his food, taking it to his basket and stroking him, and he gets watered down cat milk multiple times a day to maintain his fluids.
I have found this website a fantastic resource
www.felinecrf.org/