Written by Dr. Ng Kit Yeng, Veterinary Surgeon
What Is Peritoneal Dialysis?
Peritoneal dialysis is a medical treatment used to help cats and dogs when their kidneys are not working properly. Normally, the kidneys remove waste products, extra salts, and fluid from the body. When the kidneys fail, these harmful substances build up and make your pet very sick.
Peritoneal dialysis uses the lining inside the belly (called the peritoneum) as a natural filter. A special fluid is placed into the abdomen, where it helps draw waste and toxins out of the blood. After some time, this fluid is drained out, taking the waste with it.
Why Does My Pet Need Peritoneal Dialysis?
It is recommended when your pet have:
- Sudden kidney failure (acute kidney injury)
- Very high waste levels in the blood (uremia)
- Dangerous electrolyte problems (especially high potassium)
- Fluid overload that cannot be managed with medications alone
- Certain poisonings where toxins need to be removed quickly
Peritoneal dialysis is often chosen because it can be done safely in smaller animals, including cats and puppies, and does not require complex machines.
How Is Peritoneal Dialysis Done?
1. Placing the Catheter
A soft tube (catheter) is gently placed into your pet’s abdomen under sterile conditions. This need to be done with sedation or anesthesia to keep your pet comfortable and still. The tube allows dialysis fluid to go in and out of the belly.
2. Giving the Dialysis Fluid
A warm, sterile dialysis fluid is slowly infused through the catheter into the abdomen. This fluid stays inside for a period of time.
3. Waiting (Dwell Time)
While the fluid is inside, waste products and excess salts move from the blood into the fluid through the abdominal lining.
4. Draining the Fluid
After the waiting period, the fluid is drained out through the catheter. This fluid carries the waste products out of your pet’s body.
This process is repeated several times a day, depending on your pet’s condition.
Will My Pet Be in Pain?
Most pets tolerate peritoneal dialysis well. The procedure itself is usually not painful, though some pets may feel mild discomfort or a feeling of fullness in the belly during treatment. Pain relief and calming medications are provided if needed.
We will closely monitors your pet to ensure comfort at all times.
How Do We Care for My Pet During Dialysis?
Monitoring
Your pet will be closely watched for:
- Comfort and behavior
- Appetite and energy level
- Body temperature
- Breathing and abdominal size
- Urine output (if still producing urine)
Regular blood tests are done to check kidney values, electrolytes, and overall response to treatment.
Nutrition and Fluids
- Proper nutrition is very important for recovery
- Tube feeding or assisted feeding may be recommended if your pet is not eating
- Fluid balance is carefully controlled to avoid dehydration or fluid overload
Cleanliness and Infection Prevention
- The catheter site is kept clean and covered
- Strict hygiene is used when handling the catheter
- This greatly reduces the risk of infection
Possible Risks and Complications
As with any medical procedure, there are risks, but the veterinary team works hard to minimize them.
Possible complications include:
- Infection inside the abdomen (peritonitis)
- Leakage of fluid around the catheter
- Low protein levels due to protein loss in the fluid
- Electrolyte imbalances
Early detection and treatment of complications greatly improve outcomes.
How Long Will My Pet Need Dialysis?
The duration varies depending on the cause of kidney failure and how well your pet responds. Some pets need dialysis for only a few days, while others may need it longer.
Peritoneal dialysis is usually used as a supportive, short-term treatment, not a permanent solution.
What Is the Prognosis?
The outlook depends on:
- The underlying cause of kidney failure
- How quickly treatment was started
- Your pet’s overall health
Many pets improve significantly if their kidney condition is reversible and treatment is started early.
In Summary
Peritoneal dialysis is a gentle but effective way to help remove toxins from your pet’s body when the kidneys are not working properly. It gives your pet time and support to recover and helps them feel better while underlying problems are treated.