Electrochemotherapy (ECT) for a dog or cat costs roughly $800 to $3,000 per session, and most patients need one to four sessions spaced two to four weeks apart.
It is offered in one specific situation, and understanding that situation is most of what you need.
What it is
A chemotherapy drug — usually bleomycin, occasionally cisplatin — is given, and then short electrical pulses are delivered directly to the tumour through small electrodes.
The pulses briefly open pores in the tumour cell membranes. The drug, which normally struggles to get inside cells, floods in. Uptake increases by a large factor, which means a very small dose of chemotherapy produces a strong local effect with little of it circulating around the rest of the body.
The whole thing takes about twenty minutes under a short general anaesthetic. The pulses are painful, so it is never done on a conscious animal.
Why it was offered to you
Most owners arrive here after one of two sentences from their vet.
"We couldn't get clean margins." A tumour was removed, and the pathology report says cancer cells reach the edge of the sample. Cells are left behind. The choices are a second, larger surgery, radiation, or electrochemotherapy over the scar.
"We can't take enough tissue there." The tumour sits on an eyelid, a nostril, a foot, a lip, or around the anus — places where removing a wide margin means removing something the animal needs. ECT treats the tumour without taking the surrounding structure.
There is a third, quieter reason: an older patient where a major surgery is not a good idea, but a twenty-minute anaesthetic is.
What responds
Best evidence is in skin and just-below-the-skin tumours that the electrodes can reach:
- Mast cell tumours — the most common use in dogs
- Soft tissue sarcomas, particularly for residual disease after incomplete removal
- Squamous cell carcinoma, including on cats' noses and ear tips
- Oral tumours where access allows
- Perianal tumours
Reported response rates for these are good, with a substantial proportion achieving complete local control.
It is a local treatment. It does nothing for disease that has already spread, and it does not replace systemic chemotherapy for cancers that travel. A tumour deep inside the abdomen cannot be reached unless the surgeon is already operating and treats it during the procedure.
What actually happens on the day
Your pet is admitted in the morning, anaesthetised, and the drug is given intravenously or injected into the tumour. After a short wait, the electrodes are applied and pulses delivered across the tumour and a small margin around it. Most patients go home the same afternoon.
Afterwards the treated area typically becomes swollen and inflamed for several days, then scabs and sloughs over two to four weeks as the treated tissue dies and is replaced. This looks alarming and is the expected response — owners who are not warned often think something has gone wrong.
Side effects
Milder than most owners expect, because the drug dose is small and stays largely local:
- Local swelling, redness and scabbing at the site, resolving over weeks
- Muscle contraction during the pulses — the patient is anaesthetised and unaware
- Discomfort for a few days, managed with pain relief
- Little of the systemic toxicity associated with conventional chemotherapy — nausea and bone-marrow suppression are uncommon at these doses
Bleomycin's known concern in human medicine is lung toxicity at high cumulative doses; the doses used here are far below that range.
Being honest about the evidence
Electrochemotherapy is well established in human oncology and has a real, growing veterinary literature — mostly case series and smaller controlled studies rather than large randomised trials.
What that supports: good local control of accessible tumours, a favourable safety profile, and genuine usefulness for incompletely excised masses.
What it does not support: calling it a cure for cancer generally, or preferring it over complete surgical removal when complete surgical removal is possible. Surgery with clean margins remains the better option where it is achievable. ECT is what you reach for when it is not.
Availability is limited — this is a referral oncology procedure, not something a general practice offers.
Questions worth asking
1. What is the tumour type and grade? Response varies by type, and the answer should be specific. 2. How many sessions do you expect, and what is the total cost? Per-session pricing is misleading on its own. 3. Has it spread? Staging first. A local treatment for systemic disease is the wrong tool. 4. What is the alternative here — wider surgery, radiation, or watching? Ask for the comparison, not just the proposal. 5. How many of these do you do? A reasonable question anywhere, and particularly for a technique with limited availability.
Who isn't a candidate
- Other: Tumours that are not reachable — electrochemotherapy needs electrodes placed on or into the mass, so deep internal disease is not treatable this way unless the surgeon can reach it during an open procedure.
- Other: Widespread metastatic disease, where a local treatment cannot change the outcome and systemic therapy or palliative care is the honest conversation.
- Concurrent condition: Any condition that makes a short general anaesthetic unsafe — the pulses are painful, so this is never done conscious.
- Concurrent condition: An implanted pacemaker, or a tumour directly over the heart, because the electrical pulses can interfere with cardiac rhythm.
Common questions
How much does electrochemotherapy cost for a dog?
Roughly $800 to $3,000 per session, with most patients needing one to four sessions two to four weeks apart. Ask for the expected total rather than the per-session figure, since the number of sessions depends on tumour type, size and response. The cost usually includes the short general anaesthetic each session requires.
What is electrochemotherapy in veterinary medicine?
A chemotherapy drug, usually bleomycin, combined with short electrical pulses delivered through electrodes at the tumour. The pulses temporarily open pores in the tumour cell membranes so the drug floods in, greatly increasing uptake. That means a very small drug dose produces a strong local effect with little circulating around the body. It takes about twenty minutes under general anaesthetic.
Which tumors respond to electrochemotherapy?
Skin and subcutaneous tumours the electrodes can reach — mast cell tumours, soft tissue sarcomas, squamous cell carcinoma including on cats' noses and ear tips, some oral tumours, and perianal tumours. It is a local treatment only. It does nothing for cancer that has already spread and does not replace systemic chemotherapy for cancers that travel.
What are the side effects of electrochemotherapy in dogs?
Mostly local: swelling, redness and scabbing at the treated site, which sloughs over two to four weeks as the treated tissue dies. That looks alarming but is the expected response. Discomfort for a few days is managed with pain relief. Because the drug dose is small and stays largely local, the nausea and bone-marrow suppression associated with conventional chemotherapy are uncommon.
Is electrochemotherapy better than surgery for tumors?
No — surgery with clean margins remains the better option wherever it is achievable. Electrochemotherapy is what you reach for when it is not: when margins came back incomplete, when the tumour sits somewhere you cannot take wide tissue such as an eyelid, nostril or foot, or when a patient cannot tolerate major surgery but can tolerate a twenty-minute anaesthetic.
Sources
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