Mammary tumours are the most common neoplasm in intact female dogs. About 50% are malignant and half of those can be cured with surgery alone if margins are clean. This page covers the surgical options and their 2026 cost spread.
Surgical Categories
| Surgery | Indication | Avg cost (2026) |
|---|---|---|
| Lumpectomy (single mass, <1 cm) | Single benign mass, low stage | $800–$1,200 |
| Single mastectomy (one gland) | Single localised tumour | $1,000–$2,000 |
| Regional mastectomy (multiple adjacent glands) | 2–4 adjacent tumours, often benign-malignant mix | $1,800–$3,000 |
| Unilateral chain mastectomy (one side, 4–5 glands) | Multiple tumours on one side | $2,500–$3,800 |
| Bilateral chain mastectomy (both sides, staged 4–6 weeks apart) | Multiple tumours both sides | $2,500–$5,000 total (across two surgeries) |
| Mastectomy + ovariohysterectomy (spay same time) | Intact female with benign disease for hormonal management | $1,400–$2,300 |
Sources: DVM360 — Current Recommendations for Mammary Gland Tumors in Dogs, Sustainable Vet — Mast Cell Tumor Removal Cost (also references mammary context), PetMD — Dog Tumor Removal Cost.
This page exists as a separate entity because mammary tumours require a different staging workup than cutaneous tumours: chest X-rays, abdominal ultrasound, and full-chain palpation are mandatory.
Pre-op Staging — Why Mammary Is Different
Before any mammary mass is removed, the vet will stage the dog with at least:
| Staging test | Cost | What it reveals |
|---|---|---|
| Chest X-ray (3 views) | $200–$350 | Pulmonary metastasis |
| Abdominal ultrasound | $300–$600 | Hepatic or lymph node metastasis |
| Lymph-node FNA (especially inguinal + axillary) | $100–$200 | Regional spread |
| FNA cytology of the mass | $80–$180 | Benign vs malignant cytologic features |
| Pre-anesthetic bloodwork (CBC + chem, + coagulation) | $80–$220 | Surgical risk profile |
| Pre-op ultrasound of the mass (deep mammary) | $150–$280 | Surgical planning |
Sources: DVM360 — Recommendations for Mammary Tumours, NC State VetDerm — Staging.
A 2025–2026 multi-center retrospective (PMC — Mammary Tumor Outcomes Study) showed 25% of dogs with malignant mammary tumours have detectable metastasis at presentation. That's why staging is non-negotiable.
Cost Breakdown: Unilateral Chain Mastectomy
This is the most common complete surgery for canine mammary tumours.
| Step | Cost |
|---|---|
| Initial consult + surgical consult | $150 |
| Chest X-ray | $250 |
| Abdominal ultrasound | $400 |
| Inguinal/axillary lymph node FNA | $150 |
| Pre-anesthetic bloodwork | $180 |
| IV catheter + fluids | $90 |
| Anesthesia (90–120 min) | $450 |
| Surgical excision (one side, 4–5 glands) | $900 |
| Reconstructive closure (flap) | $250 |
| Surgical consumables + cautery | $130 |
| 1-night hospitalisation | $300 |
| Histopathology with margin review | $300 |
| Pain medication (10-day course) | $60 |
| Antibiotics | $40 |
| E-collar | $20 |
| 14-day recheck + suture removal | $90 |
| Total | $3,765–$4,860 |
Source: Sustainable Vet — Mammary/chain mastectomy cost, PetMD — tumour cost.
50th percentile for unilateral chain in 2026: ~$3,800.
Cost Breakdown: Bilateral Chain Mastectomy
Done in two stages (4–6 weeks apart) so the dog is not under anesthesia too long. Each side is similar to the unilateral figure, but the staging is shared and the cumulative cost is approximately:
| Phase | Cost |
|---|---|
| Initial pre-op staging (X-ray + ultrasound) | $650 |
| Surgery 1 — first chain | $3,800 |
| Recovery / 4-week gap | $300 |
| Surgery 2 — second chain | $3,800 |
| Total | $8,550–$10,500 |
Source: PetMD — Dog Tumor Removal Cost.
50th percentile for bilateral chain: ~$5,000–$8,500, with significant regional variance — see Tier multiplier table below.
Cost Breakdown: Single Lumpectomy
For a clearly localised, small, benign mass:
| Step | Cost |
|---|---|
| Vet consult | $90 |
| FNA cytology | $90 |
| Pre-anesthetic bloodwork | $120 |
| IV catheter + fluids | $70 |
| Anesthesia (15–25 min) | $200 |
| Surgical excision (small mass) | $300 |
| Histopathology | $180 |
| Pain medication | $30 |
| E-collar | $15 |
| Total | $1,095–$1,395 |
50th percentile: ~$1,200. Source: Sustainable Vet — Mammary/chain mastectomy, PetMD tumour cost.
Geographic Cost Modifiers for Mammary Tumour Surgery
| City tier | Lumpectomy avg | Unilateral chain | Bilateral chain |
|---|---|---|---|
| Tier 1 (NYC, SF, LA) ×1.6 | $1,600 | $6,000 | $10,000+ |
| Tier 2 (Chicago, Denver, Atlanta) ×1.25 | $1,200 | $4,500 | $7,500 |
| Tier 3 (Nashville, Indianapolis) ×1.10 | $1,100 | $4,000 | $6,500 |
| Rural ×0.80 | $800 | $2,800 | $5,200 |
Source: Cluster B — Geographic Modifiers, Sustainable Vet cost data.
See the full tumor removal cost pillar
Our 2026 pillar compares lipoma, mast cell, mammary, oral and eyelid procedure costs side-by-side, with a three-stage billing breakdown.
Read the tumor removal cost hub →When to Add Spay at the Time of Mastectomy
Intact female dogs with mammary tumours have a higher risk of new mammary tumours later in life. Adding an ovariohysterectomy (spay) during the mastectomy adds $300–$600 to the bill. Whether to do this depends on age and dog breed — older dogs with cardiac or renal risk may not be good candidates for combined procedures. Source: DVM360.
When Surgery Won't Help
| Scenario | Reason |
|---|---|
| Stage IV with pulmonary or hepatic metastasis | Surgery alone has <6 month median survival |
| Inflammatory mammary carcinoma | Median survival 30 days regardless of surgery |
| Bilateral massive disease in a 14-year-old dog | Surgical risk may outweigh benefit |
Source: NC State — Inflammatory Mammary Carcinoma outcomes.
Where Mammary Tumour Costs Differ From Other Tumours
An owner reading one cluster of tumour articles should be able to identify this page from the following distinguishing markers:
- Staging X-rays and ultrasound are mandatory (and unique to mammary).
- Lymph node cytology is a frequent pre-op requirement.
- Hormone status (intact vs spayed) matters clinically and financially.
- Reconstructive closure is more common because the gland chain is close to muscular anatomy.
- Two-stage procedures (bilateral) are uncommon for cutaneous tumours but routine for mammary.
Will pet insurance cover your dog's tumor surgery?
Most accident-illness plans reimburse 70–90% of tumor removal, histopathology, staging and even chemotherapy after your deductible. Get a personalized estimate.
Compare pet insurance →Frequently Asked Questions
How much does a single mammary tumour removal cost? 2026 median: ~$1,200 for lumpectomy; ~$3,800 for unilateral chain mastectomy.
Should I have my dog spayed at the same time? Talk to your vet. Adding a spay with mastectomy reduces risk of new mammary tumours and prevents pyometra. The combined procedure adds $300–$600.
Is mammary tumour surgery covered by pet insurance? Yes, as long as the tumour is not pre-existing. Many policies also cover the second-stage bilateral surgery. Source: Progressive Cancer Coverage, Embrace Pet Insurance.
What is the survival rate after mammary tumour surgery? Benign: ~100% cured with clean margins. Malignant: 30–80% one-year survival depending on stage, size, histological grade, and presence of metastasis. Source: DVM360 Mammary Review.
Can a dog have a chain mastectomy on both sides? Yes, in two stages, 4–6 weeks apart. Cumulative cost $5,000–$10,000+.
Sources
- DVM360 — Current Recommendations for Mammary Gland Tumors in Dogs
- Sustainable Vet — Mast Cell Tumor Removal Cost in Dogs
- PetMD — Cost and How Vets Remove Dog Tumors
- NC State Veterinary Hospital — Multimodal Mammary Tumor Management
- NC State VetDerm — Dermatology
- PMC — Canine Mammary Tumour Outcomes (2025–2026)
- Embrace Pet Insurance — Mast Cell Tumours in Dogs & Cats
- Progressive — Does Pet Insurance Cover Cancer?
- Average Cost of Dog Surgery — PetCare Cost Calculator
Last reviewed: July 28, 2026. Pricing reflects U.S. national 2026 averages for canine mammary tumour surgery and staging.