Kidney Disease in Cats
Kidney disease is common in older cats and can be easy to miss because cats often hide illness well. Early detection and ongoing veterinary care can make a meaningful difference in comfort, hydration, and quality of life.
Kidney disease needs prompt veterinary attention
Chronic kidney disease usually develops over time, but cats may look normal until significant kidney function has already been lost. Schedule a veterinary visit promptly if your cat is drinking or urinating more, losing weight, vomiting, seeming dehydrated, or acting less social. Seek emergency care right away for collapse, severe lethargy, repeated vomiting, inability to keep water down, seizures, blindness, or trouble urinating.
Symptoms to Watch For
Drinking more
Many cats with kidney disease start drinking noticeably more water.
Urinating more
Larger clumps in the litter box can be an early clue.
Weight loss
Weight loss and muscle loss may happen gradually and be mistaken for aging.
Poor appetite
Cats may eat less, become picky, or stop eating when nausea worsens.
Vomiting or nausea
Nausea, drooling, lip-smacking, or vomiting can occur as waste products build up.
Poor coat and low energy
A dull coat, hiding, weakness, or less grooming can signal illness.
What Causes Kidney Disease
In cats, kidney disease is often chronic, meaning damage builds slowly over months to years. Sometimes the exact original cause is never identified. Chronic kidney disease can develop after congenital kidney problems, kidney infections, inflammation of the kidney filters, kidney stones or ureteral stones, tumors, amyloidosis, or some viral diseases. Acute kidney injury can also happen suddenly from toxins, severe dehydration, reduced blood flow, or urinary blockage, and some cats may be left with lasting kidney damage afterward. Certain inherited problems are relevant in cats, especially polycystic kidney disease in Persian cats and related breeds.
- Older age is a major risk factor; chronic kidney disease is especially common in senior cats.
- Inherited polycystic kidney disease is seen most often in Persian cats and related breeds such as Himalayans, Exotic Shorthairs, British Shorthairs, Scottish Folds, Chartreux, Burmillas, and Siberian Neva Masquerades.
- Other possible contributors include chronic infections, kidney inflammation, stones, hypertension, and protein loss in the urine.
- Because cats hide illness well, subtle changes at home may be the first sign something is wrong.
How It's Diagnosed
Your veterinarian will usually combine history, a physical exam, blood work, and urine testing to diagnose kidney disease and determine how advanced it is. Testing often includes kidney values such as creatinine and SDMA, urinalysis to assess urine concentration, and checks for protein in the urine. Blood pressure measurement is important because hypertension commonly occurs with feline kidney disease and can damage the eyes, brain, heart, and kidneys. Imaging such as ultrasound or X-rays may be recommended to look for stones, cysts, cancer, or structural changes. Many veterinarians stage chronic kidney disease using IRIS guidelines and then further classify it by proteinuria and blood pressure to guide treatment and monitoring.
- Common tests: chemistry panel, CBC, urinalysis, urine protein testing, and blood pressure.
- SDMA may help identify reduced kidney function earlier than creatinine in some cats.
- Ultrasound can be especially useful if your vet suspects stones, polycystic kidney disease, obstruction, or cancer.
- Follow-up testing is usually needed because treatment is based on stage, hydration, appetite, blood pressure, phosphorus, and other complications.
Treatment Options
Treatment depends on whether the problem is acute or chronic, how advanced it is, and whether complications are present. For many cats with chronic kidney disease, the foundation of care includes a prescription kidney diet, maintaining hydration, and regular monitoring. Your veterinarian may also recommend medications or supportive care to manage nausea, vomiting, poor appetite, phosphorus imbalance, low potassium, hypertension, anemia, proteinuria, or dehydration. Some cats benefit from fluid therapy, but the plan should be individualized by a veterinarian. If there is an underlying cause such as infection, stones, obstruction, or polycystic kidney disease, treatment may also target that condition.
- Therapeutic kidney diets are commonly recommended and can be an important part of long-term management.
- Fresh water access, good hydration, and recheck visits are key parts of home care.
- Treatment often focuses on quality of life: appetite, nausea control, hydration, blood pressure, and comfort.
- Call your vet promptly if your cat stops eating, vomits repeatedly, seems very weak, or suddenly worsens.
Living with Kidney Disease
Frequently Asked Questions
Is kidney disease common in cats?
What are the first signs of kidney disease in cats?
Can kidney disease in cats be cured?
How do vets test for kidney disease?
When should I take my cat to the vet for possible kidney disease?
Are some cat breeds more likely to have kidney disease?
Sources
- Cornell Feline Health Center — Kidney Disease in Cats
- Merck Veterinary Manual — Renal Dysfunction in Dogs and Cats
- VCA Animal Hospitals — Chronic Kidney Disease in Cats
- AAFP/ISFM Consensus Guidelines on the Diagnosis and Management of Feline Chronic Kidney Disease
- Kidney Disease in Cats: Stages, Symptoms & Management — SpectrumCare
Disclaimer: The information provided in this article is for educational purposes only and does not constitute veterinary medical advice. Reading this content does not establish a veterinarian-client-patient relationship. Every pet is different — always consult a licensed veterinarian before making decisions about your pet's health, diet, or care. If you'd like personalized guidance, you can talk to one of our vets. If your pet is experiencing a medical emergency, contact your local emergency animal hospital immediately.