Cat Care

Chronic Kidney Disease in Cats: Signs, Causes, Treatment and Prevention

Chronic kidney disease (CKD) is one of the most common health conditions affecting cats, particularly as they get older. In fact, studies suggest that kidney disease affects a significant proportion of senior cats and may be present in up to 80% of cats over 15 years of age1.

While a diagnosis of chronic kidney disease can be concerning, early detection and
appropriate management can help slow disease progression and allow many cats to enjoy a good quality of life for years. Understanding the signs, causes and treatment options can help cat owners recognise problems sooner and seek veterinary care before the disease becomes advanced.

An orange cat crouched on a white windowsill drinking from a small white bowl, illustrating the increased thirst often seen in cats with chronic kidney disease
An orange cat crouched on a white windowsill drinking from a small white bowl, illustrating the increased thirst often seen in cats with chronic kidney disease

Key Takeaways

  • Chronic kidney disease (CKD) is one of the most common diseases in older cats.1,2
  • Early signs can include increased thirst, increased urination, weight loss and reduced appetite.
  • Kidney disease is progressive, meaning it worsens over time and cannot be reversed.
  • Treatment focuses on improving quality of life, managing symptoms and slowing disease progression.2
  • Regular veterinary health checks and screening tests can help detect kidney disease before severe symptoms develop.2

What Is Chronic Kidney Disease in Cats?

Chronic kidney disease (CKD) is a progressive condition in which the kidneys gradually lose their ability to function normally. Healthy kidneys perform several essential jobs, including:2

  • Filtering waste products from the bloodstream
  • Regulating hydration and fluid balance
  • Maintaining electrolyte levels
  • Controlling blood pressure
  • Producing important hormones involved in red blood cell production

As kidney function declines, waste products accumulate in the bloodstream, causing cats to feel unwell. Because cats are very good at hiding illness, chronic kidney disease often develops silently during its early stages.2

Many cats do not show obvious symptoms until a significant proportion of kidney function has already been lost.

Signs and Symptoms of Kidney Disease in Cats

The signs of kidney disease vary depending on the stage and severity of the condition.
 

Early Signs of Kidney Disease

In the early stages, symptoms may be subtle and easy to miss.

Common early signs include:2

  • Drinking more water than usual
  • Increased urination
  • Mild weight loss
  • Reduced appetite
  • Occasional vomiting

Because these changes often develop gradually, they may be mistaken for normal ageing.

Stage 2 and Stage 3 Kidney Disease in Cats

As kidney disease progresses, symptoms become more noticeable and may include2:

  • Significant weight loss
  • Poor appetite
  • High blood pressure (hypertension)
  • Frequent vomiting
  • Lethargy
  • Muscle wasting
  • Poor coat quality
  • Increased dehydration

At these stages, cats often require more intensive management to maintain comfort and quality of life.

Stage 4 Kidney Disease in Cats

Advanced or Stage 4 kidney disease is sometimes referred to as end-stage kidney disease. Cats may experience2:

  • Severe dehydration
  • Marked weight loss
  • Anaemia
  • High blood pressure (hypertension)
  • Pale gums
  • Weakness
  • Disorientation
  • Unkempt appearance

Without appropriate management, these signs can significantly impact a cat's wellbeing.

Know the Signs of Chronic Kidney Disease in Cats

Learn the key signs of CKD, including changes in drinking and urination habits.

What Causes Kidney Disease in Cats?

The exact cause of chronic kidney disease (CKD) is not always known. Research suggests that chronic kidney disease often develops due to a combination of factors that cause gradual and irreversible damage to the kidneys over time. Known risk factors include3:

  • Increasing age
  • Previous kidney injury
  • High blood pressure (hypertension)
  • Protein loss through the urine
  • Genetic predisposition
  • Chronic inflammation within the kidneys

In many cats, kidney damage occurs slowly over years as numerous small injuries accumulate and reduce kidney function. Certain cat breeds appear to have a higher risk of developing kidney disease, including3:

  • Persian
  • Abyssinian
  • Siamese
  • Ragdoll
  • Maine Coon

However, cats of any breed can develop CKD.

How Is Cat Kidney Disease Diagnosed?

Early diagnosis is one of the most important factors in successfully managing kidney disease. Veterinarians typically diagnose CKD using2:

  • Blood tests
  • Urine testing
  • Blood pressure measurements
  • Physical examinations
  • Assessment of hydration and body condition

Routine health checks are particularly important for cats over seven years of age, as early kidney disease may be detected before obvious clinical signs appear.

Treatment for Cat Kidney Disease

Although chronic kidney disease cannot be cured, treatment can help slow progression, reduce symptoms and improve quality of life. A treatment plan is usually tailored to each individual cat based on the stage of disease and any complications present. One of the most effective treatments for kidney disease is maintaining hydration. Fluid therapy helps2:

  • Correct dehydration
  • Improve blood flow to the kidneys
  • Flush waste products from the body
  • Improve overall comfort

In severely affected cats, intravenous fluids may be administered in hospital. Long-term hydration support may involve subcutaneous fluids given at home under veterinary guidance.

Nutrition plays a critical role in CKD management. A kidney diet for cats is specially formulated to2:

  • Reduce phosphorus intake
  • Provide controlled protein levels
  • Minimise waste product accumulation
  • Support kidney function

Many cats also require medications to manage complications associated with kidney disease. Treatment may include medications to2:

  • Control high blood pressure
  • Manage nausea and vomiting
  • Stimulate appetite
  • Address anaemia
  • Correct electrolyte imbalances

Regular monitoring allows veterinarians to adjust treatment plans as the disease changes over time.

How to Help Prevent Kidney Disease in Cats

While kidney disease cannot always be prevented, there are steps that may help reduce the risk or support earlier detection.

Maintain Good Hydration

Encouraging water intake may help support kidney health. Strategies include:

  • Providing multiple water bowls
  • Using water fountains
  • Feeding wet food where appropriate
  • Ensuring constant access to fresh water

Prioritise Dental Health

Studies have identified dental disease as a potential risk factor for chronic kidney disease3. Regular dental care and veterinary dental assessments may contribute to overall health.

Manage Underlying Health Conditions

Prompt diagnosis and treatment of conditions associated with kidney disease may help reduce kidney stress, including3:

  • High blood pressure
  • Hyperthyroidism
  • Chronic urinary tract disease

Schedule Regular Health Checks

Routine screening is one of the most important ways to identify kidney disease early. Senior cats should undergo regular veterinary examinations, including blood and urine testing, to detect changes before severe symptoms develop2.

Frequently Asked Questions

  • Why Do So Many Cats Develop Kidney Disease?

    One possible reason kidney disease is so common in cats relates to their unique biology. Cats evolved as desert-adapted animals and have highly efficient kidneys capable of concentrating urine very effectively. Compared with humans, cats have significantly fewer nephrons, the tiny filtering units within the kidneys. While this adaptation helps cats conserve water, it also means they have fewer functional units available before kidney damage begins to affect overall kidney function.

    As kidney function declines over time, cats may become more vulnerable to the effects of chronic kidney disease.

  • How Long Can a Cat Live with Kidney Disease?

    Some cats diagnosed early may live for many years with careful management, while others with advanced disease may decline more rapidly. Because every cat is different, your veterinarian is best placed to discuss prognosis based on your cat's individual circumstances.

  • When Is Euthanasia Considered for Cats with Kidney Disease?

    Deciding when to euthanase a cat with kidney disease is one of the most difficult decisions a pet owner may face. This decision is made collaboratively between the owner and veterinarian taking into account4:

    • The severity of kidney failure
    • Response to treatment
    • Quality of life
    • Appetite and hydration status
    • Comfort levels
    • Other medical conditions
    • The owner's ability to provide ongoing care

    The primary goal is always to ensure the cat's welfare and prevent unnecessary suffering while supporting the human-animal bond.

References

  1. Marino CL, Lascelles BD, Vaden SL, Gruen ME, Marks SL. (2014). Prevalence and Classification of Chronic Kidney Disease in Cats Randomly Selected from Four Age Groups and in Cats Recruited for Degenerative Joint Disease Studies. Journal of Feline Medicine and Surgery, 16, 465-472. doi:10.1177/1098612X13511446
  2. Sparkes AH, Caney S, Chalhoub S, et al. (2016). ISFM Consensus Guidelines on the Diagnosis and Management of Feline Chronic Kidney Disease. Journal of Feline Medicine and Surgery, 18, 219-239. doi:10.1177/1098612X16631234
  3. Jepson RE. (2016). Current Understanding of the Pathogenesis of Progressive Chronic Kidney Disease in Cats. Veterinary Clinics of North America: Small Animal Practice, 46, 1015-1048. doi:10.1016/j.cvsm.2016.06.002
  4. Gray C, Radford A. (2022). Using Electronic Health Records to Explore Negotiations Around Euthanasia Decision Making for Dogs and Cats in the UK. Veterinary Record, 190:e1379. doi:10.1002/vetr.1379