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What to Do If Your Cat Suddenly Stops Urinating? — Causes of Acute Kidney Failure and Emergency Response

KidneyQ&AMeongsiljang Veterinary Advisory Board

Acute kidney failure in cats progresses rapidly and can be life-threatening. It’s essential to understand the causes and emergency treatment methods accurately.

Acute Kidney Failure in Cats Is a Rapidly Progressing, Life-Threatening Condition

A cat receiving intravenous fluids at a hospital while being treated for acute kidney failure.

Acute kidney injury (AKI), also known as acute renal failure, is a serious condition in cats characterized by a sudden decline in kidney function, leading to the accumulation of waste products and toxins in the body. It typically progresses rapidly over hours to days, making early detection and immediate veterinary care critical for survival. Caution is especially important because initial blood markers such as BUN and creatinine may still appear within normal ranges. - Ingestion of toxic substances: Lily leaves, flowers, or pollen; antifreeze (ethylene glycol); and certain nonsteroidal anti-inflammatory drugs (NSAIDs) can cause severe kidney damage. Cats are particularly vulnerable to ethylene glycol. - Dehydration and reduced circulation: Insufficient fluid intake or decreased blood flow can reduce kidney perfusion, triggering acute injury. - Infectious diseases: Infections such as bacterial pyelonephritis can impair kidney function. Immediate veterinary attention is required.

Main Causes Include Ingestion of Toxic Substances, Dehydration, and Infections

Common causes of acute kidney injury in cats include ingestion of toxic substances and infections. Lilies, antifreeze (ethylene glycol), and certain nonsteroidal anti-inflammatory drugs (NSAIDs) can cause severe kidney damage. Additionally, urethral obstruction is considered one of the most common causes of acute kidney injury in cats. - Dehydration: Insufficient water intake can impair normal kidney function. - Infectious diseases: Infections such as bacterial pyelonephritis can cause direct damage to the kidneys. - Circulatory disorders: A reduction in blood flow to the kidneys due to severe hypotension or bleeding (hypovolemic or cardiogenic shock) can lead to injury. A veterinarian must identify the exact cause and initiate treatment.

The First Action Owners Should Take in an Emergency Is to Visit the Vet

If your cat shows symptoms such as loss of appetite, repeated vomiting, lethargy, or dehydration, seek veterinary care immediately. While offering more water at home can help, it is insufficient if kidney function is already impaired. A veterinarian will administer intravenous fluids and electrolytes, and perform hemodialysis if necessary. - Emergency treatment is time-critical: Visiting the hospital within 24 hours is crucial. - Preparation before arrival: Recall any substances or medications your cat may have ingested, as this greatly aids diagnosis. Prompt action improves survival rates.

A pet owner rushing to the hospital due to their cat's acute kidney failure

Emergency Signs Requiring Immediate Veterinary Care

If your cat hasn’t been drinking water for an extended period, is repeatedly vomiting, or has collapsed, you should seek veterinary care immediately. These symptoms may indicate severe acute kidney failure. In the early stages, blood test results may appear normal, so a veterinarian must check creatinine and BUN levels through blood tests to begin appropriate treatment.

Treatment Focuses on Removing the Underlying Cause and Restoring Kidney Function

Treatment begins by identifying and addressing the underlying cause. If ingestion of a toxic substance is suspected, we administer antidotes and take measures to promote urinary excretion. - Intravenous fluid therapy: This is a cornerstone treatment that replenishes fluids and electrolytes to support kidney function recovery. - Hemodialysis: In cases of severe kidney dysfunction, this may be necessary to remove toxins and restore internal balance. - Treating the underlying cause: If an infection is the culprit, antibiotics are used to eliminate the pathogen. Continuous monitoring by your veterinarian and timely adjustments to the treatment plan are essential.

A veterinarian administering an intravenous injection to a cat

Home Care Must Follow Your Veterinarian’s Instructions

Even after treatment, it’s essential to follow your veterinarian’s instructions for dietary management and medication. To reduce the burden on the kidneys, we recommend a renal prescription diet that limits protein and phosphorus, and you should encourage water intake by providing fresh water frequently. - Regular check-ups: Consistently monitor kidney function through blood and urine tests. - Preventing recurrence: It’s important to eliminate the underlying cause and remove any hazardous substances from your home. Working closely with your veterinarian will help ensure long-term health management.

Comparison of Symptoms and Responses by Stage of Acute Kidney Failure

Item	Main symptoms	Emergency response
Mild	Decreased appetite, slight dehydration	Provide more water, schedule a clinic visit
Moderate	Vomiting, lethargy, decreased urination	Visit the clinic immediately, IV fluids needed
Severe	Decreased consciousness, collapse, no urination	Visit the emergency room, consider hemodialysis

Stage-by-stage response may vary according to the veterinarian's judgment.

Precautions for Prevention

Keep cats away from lilies, antifreeze (ethylene glycol), certain nonsteroidal anti-inflammatory drugs (NSAIDs), and other toxic plants. Pay special attention to areas like kitchen cabinets, bathrooms, and gardens to ensure no hazardous substances are left within reach. Prevention is the most effective approach.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

What should I do if my cat suddenly stops drinking water?

If your pet suddenly stops drinking water and shows symptoms such as loss of appetite and vomiting, it could be a sign of acute kidney failure. However, since BUN and creatinine levels may still appear normal in the early stages, it is crucial to visit a veterinarian immediately for blood and urine tests if these symptoms are present.

Should I still take my pet to the vet if it’s been over two hours since they ingested a toxic substance?

Yes, it’s important to visit the vet within 2 hours after ingesting a toxic substance. The sooner detoxification treatment begins, the higher the chances of recovery.

What is the recovery rate after treatment for acute kidney failure?

Recovery rates vary significantly depending on the underlying cause of the injury. For instance, when the cause is ischemia (reduced blood flow), a survival rate of approximately 75% has been reported. The prognosis improves with earlier treatment, but delays can lead to progression to chronic kidney disease or a lower survival rate.

How can I prevent my cat from developing kidney failure again after it has already occurred?

Regular health checkups and preventing access to hazardous substances are key. By consulting with your veterinarian and having periodic blood and urine tests, you can detect early changes in kidney function.

Can vomiting in a cat at home be a sign of kidney failure?

Vomiting can be an early sign of kidney failure. If it occurs alongside loss of appetite and dehydration, immediate veterinary care is essential.

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References

[1] Plumb's Veterinary Drug Handbook, 9th Edition, 2022

[2] Clinical Medicine of the Dog and Cat, 4th Edition, 2020

[3] Veterinary Internal Medicine, 8th Edition, 2021