What is Peritoneal Dialysis for Dogs and Cats? — Possibilities, Indications, and When It’s Needed

KidneyQ&AMeongsiljang Veterinary Advisory Board

Peritoneal dialysis is a renal replacement therapy used to manage acute kidney failure, poisoning, and uremia when hemodialysis equipment is unavailable. I will provide accurate information on its indications, required preparations, and potential complications.

What is Peritoneal Dialysis? When Is It Needed?

A puppy receiving peritoneal dialysis treatment

Peritoneal dialysis is a renal replacement therapy that involves infusing dialysis fluid into the abdominal cavity, using the peritoneum as a natural filter to remove waste products and excess fluid from the body. The key takeaway is that it’s a “race against time.” This treatment buys time for the kidneys to recover on their own in cases of severe uremia, hyperkalemia, or poisoning that cannot be corrected with medications and intravenous fluids alone. While hemodialysis requires expensive specialized equipment and personnel, peritoneal dialysis can utilize the peritoneum itself as the dialysis membrane without the need for extracorporeal circulation machinery. Therefore, its greatest advantage is relative accessibility, even at regional clinics where transferring patients to a hemodialysis center may be difficult.

Principles of Peritoneal Dialysis — How Are Waste Products Removed?

When a special dialysis solution is infused into the abdominal cavity, a concentration gradient forms between the blood and the solution across the peritoneum, the thin membrane lining the abdominal wall. This gradient allows waste products such as urea, creatinine, and potassium to move from the blood into the dialysis solution. After a set period, the solution is drained, carrying the waste products out with it. Fluid removal is controlled by adjusting the glucose concentration of the dialysis solution.

Main Indications for Peritoneal Dialysis

Acute Kidney Injury (AKI): Severe uremia that does not respond to medication or fluid therapy

Hyperkalemia: An emergency situation accompanied by electrocardiogram changes

Toxicity: Ethylene glycol, grapes, lilies, NSAID toxicity, etc.

Post-ureteral obstruction recovery phase: Bridging therapy until kidney function recovers immediately after surgery

Severe acid-base imbalance: Cases requiring correction of metabolic acidosis

This treatment is frequently used to save lives in cases of acute kidney failure caused by lily poisoning in cats or grape poisoning in dogs.

Contraindications for Peritoneal Dialysis

Peritoneal dialysis is contraindicated in cases of intra-abdominal adhesions or tumors, recent abdominal surgery, peritonitis, severe coagulopathy, or diaphragmatic hernia. It should also be approached with caution in patients with severe hypoalbuminemia, as protein loss may worsen, or those with acute pancreatitis. In these situations, consider transferring the patient to a specialized hospital equipped to perform hemodialysis or continuous renal replacement therapy (CRRT).

Peritoneal Dialysis vs. Hemodialysis Comparison

Item	Peritoneal Dialysis	Hemodialysis
Equipment Requirements	Relatively simple	Expensive specialized equipment essential
Procedure Difficulty	Moderate	High (specialized personnel)
Weight Restrictions	Advantageous for small patients such as small-breed dogs and cats	Difficult for very small patients due to increased risk
Waste Removal Efficiency	Slow (several hours)	Fast (tens of minutes to several hours)
Infection Risk	Risk of peritonitis	Risk of catheter infection
Accessibility	Available at medium to large hospitals	Available only at some specialized hospitals

The veterinarian selects the optimal method based on the patient's condition and the clinic's capabilities.

Peritoneal Dialysis Procedure

Step 1: A peritoneal dialysis catheter is inserted into the abdominal cavity while the patient is under general anesthesia or sedation. For long-term use, surgical placement of the catheter is recommended. Step 2: Dialysate is infused into the abdominal cavity. Initially, start with a relatively small volume of 10–20 mL per kilogram of body weight. If leakage occurs, begin at one-quarter of the calculated volume and gradually increase while monitoring the patient’s condition. Step 3: Allow the dialysate to remain in the abdominal cavity for 30 minutes to 1 hour (this period is called the "dwell time"). Step 4: Drain the dialysate by gravity and replace it with fresh dialysate. This process is repeated multiple times a day, with veterinary staff present around the clock to manage care at regular intervals.

Dialysis fluid and catheter used in peritoneal dialysis

Potential Complications During Treatment

Peritoneal dialysis is an effective treatment, but it does carry the risk of complications. The most common complication in veterinary patients is dialysate leakage around the catheter at the insertion site. While peritonitis is common in humans, it is relatively rare in veterinary reports (one institution reported no cases in dogs over four years, and only one case among 22 cats over five years). Other potential complications include hypoalbuminemia (loss of protein into the dialysate), hyperglycemia, respiratory distress (due to increased intra-abdominal pressure), and catheter obstruction (caused by the omentum). Intensive 24-hour monitoring and checking fluid status, electrolytes, and blood glucose levels two to four times daily are essential.

Treatment Duration and Prognosis — How Long Does It Last?

Peritoneal dialysis is typically performed for a few days to about ten days. In cases of acute kidney injury, the goal is to buy time for kidney function to recover spontaneously after removing the underlying cause. The prognosis varies significantly depending on the underlying cause rather than a specific recovery rate. For example, ischemic acute kidney injury shows a survival rate of approximately 75% according to reports, whereas cases caused by nephrotoxic substances vary widely depending on the specific toxin and the timing of initial diagnosis. In particular, the sooner treatment begins for poisoning, the better the prognosis. For ethylene glycol poisoning, the prognosis is generally favorable if treatment starts within 5 to 8 hours of ingestion in dogs and within 3 hours in cats. However, the prognosis worsens if treatment is delayed or if urine output decreases (oliguria or anuria). Check for early warning signs in Symptoms and Management of Acute Kidney Failure.

Home Care Points After Peritoneal Dialysis

Monitor water intake: Keep a daily log of water consumption and urine output to track kidney function recovery.

Renal prescription diet: A low-protein, low-phosphorus diet remains beneficial during the recovery phase.

Regular blood tests: Follow-up monitoring of BUN, creatinine, and SDMA is essential at one week, one month, and three months post-discharge.

Infection prevention: Keep the catheter removal site clean and return to the clinic immediately if any abnormal discharge occurs.

Preventing recurrence: Pets that have experienced acute kidney injury are at higher risk of progressing to chronic kidney disease, making lifelong kidney management crucial.

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

How much does peritoneal dialysis cost?

Costs vary significantly depending on the hospital and the duration of treatment. The total includes expenses for catheter insertion, dialysis fluid, 24-hour monitoring, and diagnostic tests, and typically requires a hospital stay of several days. For an accurate estimate, please consult with your attending veterinarian.

Can cats also receive peritoneal dialysis?

Yes, in fact, for smaller cats, peritoneal dialysis is often a more practical option than hemodialysis. It’s particularly useful in cases of acute kidney injury caused by lily poisoning.

Can peritoneal dialysis be performed at home?

It’s not possible. While humans can undergo peritoneal dialysis at home, pets require 24-hour veterinary nursing care and strict sterile procedures, so hospitalization is always necessary.

Can the kidneys fully recover after peritoneal dialysis?

It depends on the underlying cause. In cases of temporary poisoning or drug-induced kidney injury, the chances of recovery are high. However, when chronic kidney disease becomes acutely exacerbated, full restoration of kidney function may not be possible.

Which veterinary hospitals offer peritoneal dialysis?

This is available at large-scale veterinary hospitals and university veterinary teaching hospitals that have an intensive care unit and staff on duty 24 hours a day. In emergency situations, your attending veterinarian will guide you to the most appropriate referral hospital.

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References

[1] Ettinger SJ, Feldman EC, Cote E. Textbook of Veterinary Internal Medicine, 8th ed. Chapter on Acute Kidney Injury and Renal Replacement Therapy

[2] Cowgill LD, Francey T. Hemodialysis and Extracorporeal Blood Purification. In: Fluid, Electrolyte, and Acid-Base Disorders in Small Animal Practice, 4th ed.

[3] Bersenas AM. A clinical review of peritoneal dialysis. J Vet Emerg Crit Care, 2011, 21(6):605-617