A nephrectomy — surgical removal of a kidney — costs roughly $2,500 to $6,000 for a dog or cat, including imaging, surgery and hospitalisation.
The question every owner asks first has a good answer, with one important condition attached.
Can a pet live with one kidney?
Yes, and usually with no restrictions at all. Dogs and cats have substantial functional reserve; the remaining kidney compensates by increasing its filtration, and most patients go on to a completely normal life expectancy with normal energy, appetite and water intake.
The condition is that the remaining kidney has to be genuinely healthy.
That is not an assumption anyone should make by eye. Before a planned nephrectomy your vet should measure what the other kidney can do — through bloodwork, urine concentrating ability, imaging, and where available a GFR study or split renal function assessment that quantifies each kidney separately.
This is the question to ask. "How do you know the other kidney can manage?" A good answer describes a measurement. A vague one is worth pushing on.
When a kidney comes out
- A kidney tumour. Renal carcinoma, and in dogs occasionally lymphoma or a nephroblastoma in young animals.
- Irreversible obstruction. A stone or stricture has blocked the ureter long enough that the kidney behind it is destroyed.
- Severe trauma. A road accident or a fall causing bleeding that cannot be controlled any other way.
- Chronic infection. A non-functional kidney acting as a reservoir of infection, seeding the bloodstream.
- Refractory high blood pressure driven by a diseased kidney.
- A congenital abnormality in a young animal causing pain or infection.
The conversation cat owners should have first
Feline ureteral obstruction — usually a tiny stone lodged in the ureter — is common, and the affected kidney can look ruined on ultrasound.
Modern practice increasingly favours saving that kidney rather than removing it, using a subcutaneous ureteral bypass (SUB) device or a ureteral stent to route urine around the blockage. Kidneys that appear non-functional after an acute obstruction often recover meaningful function once the pressure is relieved, and in a cat that may well develop chronic kidney disease later, every nephron matters.
If you have been told your cat's kidney must come out, it is entirely reasonable to ask whether a SUB or stent has been considered, or to seek a second opinion from a centre that places them.
The surgery
Under general anaesthetic, the abdomen is opened, the kidney is freed from its attachments, and the renal artery, renal vein and ureter are individually ligated and divided. The ureter is removed with the kidney when infection or a tumour is involved.
It typically takes one to two hours. The main risks are bleeding from the renal vessels, which are large and short, and the anaesthetic itself.
Where a tumour extends into the vena cava, the operation becomes considerably more complex and not every centre will attempt it — which is why the CT scan beforehand is what decides the plan.
Recovery
- Two to four nights in hospital, with intravenous fluids and monitoring of kidney values
- Bloodwork before discharge, to confirm the remaining kidney has taken over
- Two to three weeks of restricted activity at home, with a cone until sutures are out
- A recheck at ten to fourteen days, then bloodwork at intervals for the first year
- Most pets are eating and comfortable within a few days
Call your vet for reduced urination, vomiting, refusal to eat, a swollen or discharging incision, or worsening lethargy.
Outlook
For trauma, obstruction or infection, removing the problem kidney generally means a normal life afterwards.
For tumours it depends on the type and whether it has spread. Renal carcinoma confined to one kidney and completely removed can give substantial survival time; cases with metastases at diagnosis do considerably less well. Chest imaging and abdominal CT before surgery are what tell you which situation you are in, and they should happen before you commit.
Living with one kidney
Little changes day to day, but a few things are worth doing:
- Constant access to fresh water, always
- Bloodwork and urinalysis at your vet's recommended interval — typically six to twelve monthly
- Caution with NSAIDs, which stress kidney blood flow. Tell every vet your pet has one kidney before any medication or anaesthetic.
- A kidney-support diet only if bloodwork later indicates it, not pre-emptively
Who isn't a candidate
- Other: A remaining kidney that cannot carry the load on its own — this is the whole decision, and it is settled by measuring split kidney function before surgery, not by assuming.
- Concurrent condition: Existing chronic kidney disease, where removing functioning tissue can tip a stable patient into renal failure.
- Other: Widespread metastatic disease from a kidney tumour, where surgery costs recovery time without buying survival.
- Concurrent condition: A patient who is not stable enough for a long abdominal anaesthetic — nephrectomy is rarely so urgent that stabilisation cannot come first.
Common questions
How much does kidney removal cost for a dog?
Roughly $2,500 to $6,000 including imaging, surgery, anaesthesia and two to four nights of hospitalisation. A tumour case needing CT staging and chest imaging sits at the upper end, as does any case where the tumour extends into the vena cava and the operation becomes a vascular procedure. Ask for the all-in figure rather than the surgical fee.
Can a dog live with one kidney?
Yes, usually with no restrictions and a normal life expectancy — dogs and cats have substantial functional reserve and the remaining kidney compensates by filtering more. The condition is that the remaining kidney must be genuinely healthy, which should be measured before surgery through bloodwork, urine concentrating ability, imaging and where available a split renal function study.
What is the survival time after kidney removal for a tumor?
It depends on tumour type and whether it has spread. A renal carcinoma confined to one kidney and completely removed can give substantial survival time; cases with metastases already present at diagnosis do considerably less well. Chest imaging and abdominal CT before surgery are what tell you which situation you are in, and both should happen before committing.
How long is recovery after a nephrectomy in dogs?
Two to four nights in hospital on intravenous fluids with kidney values monitored, then two to three weeks of restricted activity at home with a cone until sutures come out at ten to fourteen days. Most pets are eating and comfortable within a few days. Bloodwork before discharge confirms the remaining kidney has taken over the workload.
What causes a kidney to need removing in cats?
Most often a ureteral obstruction from a tiny stone, plus tumours, severe trauma and chronic infection. For obstruction specifically, modern practice increasingly favours saving the kidney with a subcutaneous ureteral bypass device or a ureteral stent, because kidneys that look non-functional often recover once pressure is relieved. It is reasonable to ask whether that has been considered.
Sources
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