How Much Does It Cost to Remove a Lump or Mass on a Dog or Cat? FNA, Biopsy, and Surgery Priced Out

Step One: The Fine-Needle Aspirate That Tells You Whether to Worry

A fine-needle aspirate (FNA) is the cheapest way to get an answer: a small needle, no sedation, cells read in-house or shipped to a lab. Expect $50-$250, depending on whether the sample is read on-site or sent out for cytology.

When Cytology Isn't Enough: Biopsy and Histopathology

FNA cells can't always confirm a diagnosis, especially for masses that shed cells poorly. A surgical biopsy sent for histopathology adds $250-$500 on top of sedation, and is often the step that decides whether removal is urgent or elective.

A Straightforward Lipoma: $250-$700, More in a Bad Spot

Most benign fatty lumps (lipomas) in dogs run $250-$700 to remove when they sit somewhere easy to reach. Push it toward the armpit, groin, or between toes, and anesthesia time climbs — $1,000-$1,800 isn't unusual for a deep or awkward one.

When It's Not a Lipoma: Wider Margins Cost More

A tumor needing wide surgical margins — extra tissue removed around the edges to catch microscopic cells — takes longer under anesthesia and may need a pre-surgical ultrasound to check for spread. Total bills for suspicious masses commonly land at $1,500-$3,000 at a general practice, more with a board-certified surgeon. A malignant biopsy shifts the math toward a full cancer treatment protocol rather than a one-time excision.

Cats Pay More for the Same Kind of Surgery

Cat skin masses sit closer to muscle with less loose skin to close over, so a "simple" removal often runs $500-$1,500. Mammary masses worry vets more in unspayed cats — roughly 40-50% are malignant, versus far fewer in dogs — so biopsy comes before surgery.

The Pre-Surgical Workup That Doesn't Show Up in the First Quote

Standard bloodwork to confirm anesthesia is safe adds $75-$200, and a deep mass may need a CT or MRI referral, adding well over $1,000. None of it is padding — it's the same staging workup every surgical patient goes through.

FAQ: Multiple Masses, Insurance, and What Actually Drives the Bill

Does removing three lumps cost three times as much? No — the first mass carries most of the anesthesia and facility fee, and each extra lump typically adds only $100-$500. Does pet insurance help? Accident-and-illness plans generally cover mass removal and biopsy if the lump is new and unrelated to any pre-existing condition — check your policy and premium before assuming it's covered. This article is cost information only, not veterinary advice — have any new lump evaluated by a licensed veterinarian.