Chronic kidney disease (CKD) is one of the most common conditions in older dogs and cats, affecting an estimated 30-40% of cats and 10-15% of dogs over 15 years of age. Managing CKD with welfare at the centre requires understanding the disease experience, treatment options, and quality-of-life assessment.
CKD causes accumulated uremic toxins, leading to nausea, loss of appetite, lethargy, weakness, and in advanced stages, vomiting, diarrhea, and neurological signs. The experience of chronic nausea and reduced wellbeing is significant. Hypertension (common in both cats and dogs with CKD) can cause acute blindness from retinal detachment and neurological signs from hypertensive encephalopathy.
Importantly, animals cannot understand their diagnosis or anticipate future decline. Welfare management must focus on current quality of life rather than abstract longevity.
The International Renal Interest Society (IRIS) staging system classifies CKD into stages I-IV based on creatinine, SDMA, and urine protein:creatinine ratio. Staging guides treatment intensity and welfare monitoring. Early-stage CKD (I-II) requires monitoring and preventive management; advanced stages (III-IV) require intensive management and careful quality-of-life assessment.
Prescription renal diets — reduced in phosphorus, moderate protein restriction, with enhanced omega-3 fatty acids — are a cornerstone of CKD management. They reduce uremic toxin accumulation and slow progression. However, welfare requires that animals actually eat these diets. A cat experiencing nausea refusing to eat a renal diet is a welfare concern — palatability and acceptance must be balanced against nutritional goals.
Managing symptoms significantly improves quality of life. Anti-nausea medications (maropitant, ondansetron) reduce nausea and improve appetite. Phosphate binders reduce phosphorus absorption. Antihypertensives (amlodipine for cats) control blood pressure. Erythropoietin-stimulating agents address anemia. Each intervention targets a specific source of welfare compromise.
Regular quality-of-life (QoL) assessment is essential in managing a progressive disease. The HHHHHMM (Hurt, Hunger, Hydration, Hygiene, Happiness, Mobility, More Good Days than Bad) scale and similar tools help owners and veterinarians assess when QoL has declined to the point where euthanasia becomes the most welfare-positive decision.
Euthanasia for advanced CKD, when quality of life is severely compromised, is an act of welfare. The welfare imperative is to offer euthanasia before the animal suffers unnecessarily — not to delay until crisis. Veterinary-owner communication about prognosis, QoL monitoring, and euthanasia should begin early in CKD management, not at the point of crisis.