How do you feed a cat in end-stage kidney failure (CKD stage 4)?

At IRIS stage 4 the first aim becomes maintaining food intake and comfort, more than perfect phosphorus restriction. A cat that does not eat declines fast. The renal diet stays ideal if accepted; otherwise any calorie-dense food that is eaten takes priority. The vet steers these care trade-offs (IRIS, 2023). Expert deep dive ### Why does the priority invert at stage 4? Stage 4 is end-stage kidney failure, with severe azotaemia and marked uraemic signs. At this point anorexia threatens short-term survival. The nutritional logic shifts: keeping calories in and limiting nausea come before dietary perfection (IRIS, 2023). The renal diet keeps its value if the cat accepts it, because it limits the uraemic load, but it must not come at the cost of prolonged fasting. ### Which nutritional supports help at end stage? Vets often combine renal diet, binders, appetite stimulants, anti-sickness drugs and sometimes a feeding tube to guarantee intake, with fluid therapy to support hydration. Notable fact: each 1 mg/dL rise in serum phosphorus has been linked to roughly a 12% higher death risk in cats with CKD, so phosphate control stays worthwhile even late, as far as tolerated (Boyd et al., J Vet Intern Med, 2008). End-of-care decisions, comfort included, belong to the conversation with the vet. Comparison table | Stage-4 priority | Means | Limit | |---|---|---| | Maintain intake | accepted food, appetite stimulant | do not impose fasting | | Limit uraemia | renal diet if tolerated, binders | per appetite | | Support hydration | fluid therapy, wet food | veterinary follow-up | | Preserve comfort | anti-sickness drugs, split meals | ongoing review | Petipedia's take Petipedia notes that at end stage nutrition sits within a comfort-and-support logic, defined case by case by the vet.