10 Signs of Kidney Disease in Cats That Owners Often Overlook

Cats may seem perfectly fine... but kidney disease could be creeping up unnoticed.

Kidney disease in cats is one of the most common chronic conditions, especially in senior cats. Often, owners do not notice the abnormalities in time because early-stage symptoms are rarely clear and progress very gradually. By the time a cat shows obvious symptoms, the disease may have already reached a stage where the kidneys have lost much of their function.

The good news is that if owners recognize the early warning signs and bring their cats in for regular health check-ups, they can help slow the disease's progression and improve their cat's quality of life in the long run.

Let's take a look at the 10 signs of kidney disease in cats that owners often overlook.

What is Kidney Disease in Cats?

The kidneys play a crucial role in filtering waste, maintaining water and mineral balance, and regulating blood pressure. When kidney function declines, waste accumulates in the body, affecting various systems and leading to subsequent health issues.

Chronic Kidney Disease (CKD) is a common condition in cats over 7 years old. It is an incurable disease, but the deterioration of the kidneys can be managed and slowed down if detected early.

10 Signs of Kidney Disease You Shouldn't Overlook

10 Signs of Kidney Disease You Shouldn't Overlook

1. Drinking Unusually Large Amounts of Water

One of the most common early signs is a cat starting to drink more water. Because the kidneys lose their ability to conserve water, the body tries to compensate by stimulating the urge to drink. If you find yourself refilling the water bowl more often than usual, it is a warning sign worth watching.

2. Urinating More Frequently or in Larger Volumes

When the kidneys malfunction, they can no longer concentrate urine as they used to. This results in the cat urinating more often or producing a larger volume of urine than normal.

3. Unexplained Weight Loss

Cats with kidney disease often lose muscle mass and body weight slowly over time. Many owners mistake this for a normal part of aging, thereby missing the opportunity for early detection.

4. Loss of Appetite

The buildup of waste in the bloodstream can make cats feel nauseous and lose their appetite. If your cat starts eating less or becomes a much pickier eater than usual, keep a close eye on them.

5. Frequent Vomiting

Chronic vomiting is another common sign in cats with kidney disease. This is caused by toxins and waste products that the body is unable to excrete normally.

6. Abnormal Bad Breath

Cats with kidney disease may have breath that smells like ammonia or has an unusually pungent odor. The cause is the accumulation of waste products in the bloodstream.

7. Lethargy and Decreased Playfulness

If a once-playful cat starts sleeping more, loses interest in toys, or hides in corners of the house, it could be a sign that their body is struggling.

8. Dull, Unkempt Coat

Coat health can reflect internal health. Cats with kidney issues often have dry, coarse, and unkempt fur as their overall health declines.

9. Dehydration

Even though they drink more water, some cats with kidney disease can still become dehydrated. You can notice this through:

• Dry gums
• Loss of skin elasticity (skin returns to normal slowly when pinched)
• Easy lethargy

10. High Blood Pressure and Vision Abnormalities

Kidney disease can affect blood pressure. In some cases, this can lead to retinal detachment, resulting in decreased vision or sudden blindness.

Which Cats Are at Higher Risk?

The groups that should receive regular health check-ups include:

• Cats aged 7 years and older
• Cats that drink very little water
• Cats fed primarily dry food
• Cats with a history of urinary tract diseases
• Cats with high blood pressure
• Cats with other chronic illnesses

How is Kidney Disease Diagnosed?

A veterinarian may consider additional tests, such as:

• Physical examination
• Blood tests
• Kidney function panel
• SDMA test (an early biomarker for kidney function)
• Urinalysis
• Abdominal ultrasound

Note: Regular screening helps catch abnormalities before symptoms become severe.

Ways to Reduce the Risk of Kidney Disease

• Encourage Hydration: Entice your cat to drink more water (e.g., using water fountains).
• Dietary Adjustments: Add wet food to their daily meals.
• Weight Management: Maintain their weight within a healthy range.
• Annual Check-ups: Schedule yearly veterinary visits.
• Routine Testing: Do blood and urine tests as recommended by your vet.
• Daily Observation: Regularly monitor their drinking and urinating habits.

Conclusion

Kidney disease in cats is a common condition, especially in seniors, and often starts with minor symptoms that owners might overlook—such as increased drinking, frequent urination, weight loss, or a lack of appetite.

The earlier it is detected, the better the chances of planning an effective treatment regimen and slowing the kidneys' decline. Therefore, observing daily behaviors and scheduling regular health check-ups are essential practices that should not be ignored.