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Kidney Failure in Cats

Your cat’s kidneys do many important things. They help manage blood pressure, make hormones and red blood cells, and remove waste from her blood.

Cats’ kidneys begin to fail with age. Untreated, kidney disease can lead to a series of health problems. When it’s chronic, there’s no cure. But with early diagnosis and good care, you can help boost both the quality and length of your pet’s life.

Older cats aren’t the only ones at risk. Kittens can be born with kidney diseases. Trauma and infection are also causes.

Types of Kidney Disease

There are two types of kidney failure in cats. Each has different causes, treatments, and outlooks.

Acute renal failure develops suddenly, over a matter of days or weeks. It happens in cats of all ages and is usually the result of:

  • Poisons, which are the most common cause of acute renal failure. Antifreeze, toxic plants like lilies, pesticides, cleaning fluids, and certain human medications are highly poisonous to your cat’s kidneys. Even a single tablet of ibuprofen can lead to her kidneys shutting down. Check around your house and garage for these substances and make sure your cat can’t get into them.
  • Trauma, especially involving a broken pelvis or burst bladder.
  • Shock from losing a lot of blood quickly or rapid dehydration. Overheating in hot weather, a significant rise in activity, vomiting, and diarrhea can all cause a big dip in fluids.
  • Infection in the kidneys.
  • Blockages that change the flow of blood into the kidney and the flow of pee out of it. 
  • Heart failure with low blood pressure, which reduces blood flow to the kidneys.

If diagnosed in time, acute renal failure can often be reversed. But chronic kidney problems can be harder to treat. Found mostly in middle-aged and older cats, they develop over months and even years. If your cat is 7 years or older, pay special attention to her health.

While the exact causes of chronic kidney disease aren’t always clear, even to vets, they include:

  • Kidney infections and blockages, which may not result in acute renal failure, but wear down kidney function at a low level for months or years.
  • Other conditions, from advanced dental disease and high blood pressure to thyroid problems and cancer.

11 Signs Your Cat’s Kidneys May Be Failing

  • Frequent peeing. While you might think this is a sign your cat’s kidneys are working well, it actually means she’s no longer able to hold water. Peeing outside her litter box is another signal.
  • Drinking a lot of water. This means your cat is trying to replace the fluid she’s lost through peeing.
  • Bacterial infections of the bladder and kidney, which develop more easily in the dilute pee produced by failing kidneys.
  • Weight loss and decreased appetite.
  • Vomiting, diarrhea, and bloody or cloudy pee.
  • Mouth ulcers, especially on the gums and tongue.
  • Bad breath with an ammonia-like odor.
  • A brownish-colored tongue.
  • A dry coat.
  • Constipation.
  • Weakness and indifference.

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