A senior cat's lifespan with kidney failure varies greatly, from months to years, depending on the disease stage at diagnosis and treatment effectiveness; early-stage (IRIS Stage 2) cats might live 2-3+ years with proper care, while late-stage (Stage 4) cats often live under 6 months, though good management with diet, fluids, and meds can significantly extend life, sometimes even for years beyond initial prognosis.
Symptoms of end stage kidney failure in cats include dull sunken eyes, inability to walk, body odour, incontinence in bladder or bowels, refusal to eat or drink, seizures, confusion, pacing and restlessness, withdrawing, hiding and running away.
If your cat is suffering from acute kidney failure you may also notice an arched back or stiff-legged gait, symptoms that your cat's kidneys are causing pain.
Cats with Stage III disease have an average life expectancy of between 6 months and 18 months. Sadly, cats with Stage IV disease will usually only live for a month or two after diagnosis. Your vet should be able to tell you what stage your cat's kidney disease is at.
Focus on comfort by offering small, palatable meals like watered-down wet food. Maintain hydration and monitor medication tolerance. Pain management and anti-nausea drugs may be prescribed. Regular vet check-ins help adjust care. Creating a calm environment and gentle handling improve quality of life during this stage.
Chronic kidney failure in cats is a gradual condition that typically develops over several months or even years. This type of kidney failure is typically caused by autoimmune diseases, cysts in the kidneys, and genetics.
Acute Kidney Failure in Cats
Cats with ARF may regain some kidney function with treatment, supportive care, and time, depending on the cause. Even with treatment, ARF is terminal in about 50% of cases.
Maintaining good hydration is essential for cats with CKD, as dehydration can speed up damage to the kidneys and cause clinical signs to worsen. At home, this can be encouraged by feeding wet forms of the therapeutic diet and ensuring access to multiple clean water sources.
The four stages
Stage 1: Creatinine below 140umol/L; 65% lost function. Stage 2: Creatinine 140-249 umol/L; 66-75% lost function. Stage 3: Creatinine 250-440 umol/L; 76-90% lost function. Stage 4: Creatinine above 440umol/L; more than 90% lost function.
Chronic kidney disease used to be called chronic kidney failure. It is mainly a problem in mature and senior cats (seven years and older), affecting an estimated 30-40% of cats over 10 years and 81% of cats over 15 years. Only about 10% of the cases occur in cats less than three years old.
Anticipatory grief means that you worry about and grieve over losing someone you love before they have actually gone. When you are caring for a terminally ill cat it is common to panic if your cat is having an off day, even though ups and downs are very common in CKD.
Bad Breath and Oral Ulcers
Cats with advanced stage kidney failure may develop a strong, ammonia-like odor to their breath. Additionally, oral ulcers can cause pain and discomfort, further contributing to a poor appetite and weight loss.
In cats with CKD, the kidneys don't function well and are unable to filter waste products, so those compounds build up in the bloodstream and result in one or more signs of illness, such as nausea, loss of appetite, lack of energy, or weight loss.
Low Body Temperature
Healthy cats have a temperature between 37–38°C. As their organs begin to shut down, their body temperature drops. You may feel this in their ears, paws, or nose, which can become cool to the touch. You can monitor their temperature at home or speak with your vet for further care or guidance.
In the last weeks and days of kidney failure, signs that death is near include: Little or no urine output. Decreased blood pressure. Decreased body temperature.
“They may be trying to protect vital organs that are in distress, and they may generally be in pain or under stress,” says Quandt. For example, kidney disease has been linked to the version of the meatloaf position where the head is down on the ground and the front paws may be extended, he adds.
Renal failure in cats can progress from subtle changes to a life-threatening emergency in a matter of days. Knowing when to seek immediate veterinary care could save your cat's life. Many cat owners miss the early warning signs of kidney problems until the condition becomes serious.
Age: Similar to humans, cats experience a decline in organ function as they get older, making them more susceptible to kidney issues. Hydration: Cats are naturally less inclined to drink water, and chronic dehydration can put extra stress on their kidneys.
We found that participants with progressive CKD spent a median of 7.9 years in stage 3a, 5 years in stage 3b, 4.2 years in stage 4, and <1 year in stage 5.
Additionally, indications of acute kidney failure include an arched back or stiff-legged gait (a symptom that your cat's kidneys are causing pain), and either frequent or no urination. Because chronic kidney failure may gradually progress over years, you may not notice it.
Acute kidney failure can sometimes be reversed with rapid and intensive vet care. But it's a life-threatening illness and around 50% of cats who develop acute kidney failure won't survive. Cats who do recover may develop long-term health problems, especially chronic kidney disease (CKD).
Low-phosphorus diets can also help to reduce nausea. Diets containing chicken and some types of fish as their protein source are often lower in phosphorus. As a general rule, diets for cats with CKD should contain around 0.3-0.6% phosphorus on a dry matter basis.
A cat with kidney disease benefits from a diet specifically formulated to manage this condition. These diets are usually lower in protein, phosphorus, and sodium while having higher levels of omega-3 fatty acids and antioxidants. While Fancy Feast is popular, it may not meet these criteria.
How kidney disease in cats is treated
Without treatment, cats in advanced stages of kidney failure may only survive a few weeks to a few months. However, with appropriate management, many live much longer. Sometimes for several years, with a good quality of life.