Found a Lump on Your Dog? Here's How to Tell If It's a Lipoma.

You’re giving your dog a belly rub and your hand stops on something unfamiliar: a soft, squishy lump just under the skin. Your stomach drops a little. That’s a completely normal reaction, and you’re right to pay attention to it.

The good news: most lumps like this turn out to be lipomas, which are benign (non-cancerous) fatty tumors made up of fat cells that cluster together under the skin. They’re especially common in older dogs and overweight dogs. But here’s the thing, you can’t know that for sure just by feeling it. Only a vet can confirm what a lump actually is, and it usually takes nothing more than a quick, low-stress procedure.

What is a lipoma in dogs?

A lipoma is a benign tumor made up of fat cells, also called an adipose tumor. “Benign” means it doesn’t invade surrounding tissue or spread to other parts of the body the way a cancerous tumor would. It’s essentially a pocket of fat that forms in the wrong place, sitting just beneath the skin and moving slightly when you press it.

They typically feel soft, smooth, and well-defined: kind of like a water balloon filled with something slightly firmer than water. They can appear anywhere on the body, but common spots include the chest, abdomen, upper legs, and neck. They tend to grow slowly and don’t usually cause pain when touched.

What causes lipomas, and which dogs get them?

The honest answer is that vets don’t fully understand why some dogs develop lipomas and others don’t. What they do know is that certain factors seem to increase the likelihood:

• Age: Lipomas are most common in middle-aged and older dogs. If your dog is over seven and you find a soft lump, a lipoma is high on the list of possibilities.
• Weight: Overweight dogs develop lipomas more frequently, though lean dogs can get them too.
• Breed: Labrador Retrievers, Dobermans, Cocker Spaniels, Miniature Schnauzers, and mixed breeds all show higher rates. Labrador Retrievers in particular are well-known for developing multiple lipomas over their lifetime.
• Sex: Female dogs appear to be diagnosed with lipomas slightly more often than males, though the difference isn’t dramatic.

There’s no single confirmed cause. Genetics, diet, and hormonal factors may all play a role. What matters most right now is that a lump has appeared, and it needs a vet’s attention.

What does a lipoma look and feel like?

From an owner’s point of view, a typical lipoma shows up as a sudden lump on your dog under the skin. Here’s what tends to characterize one:

• Soft and squishy to the touch
• Movable: it slides around slightly under the skin when you press it
• Smooth edges, fairly well-defined shape
• Not painful when touched (your dog shouldn’t flinch or pull away)
• Slow-growing: you might notice it’s bigger over months, not days
• Skin over the lump looks normal (no ulceration, redness, or discharge)

Lipomas can appear on the neck, chest, belly, or legs. A lipoma on a dog’s neck, for example, often gets noticed when owners are petting or grooming. Size can vary widely – from a marble to a grapefruit.

Lipoma vs. cancer: how do you tell them apart?

This is the question keeping you up at night, and it deserves a straight answer: you can’t tell the difference by feel alone. Neither can your vet, without testing. That’s not a flaw in the system, it’s just how soft tissue lumps work.

A fine needle aspiration (FNA) is the standard first step. Your vet inserts a small needle into the lump and draws out a sample of cells, then examines them under a microscope (this cell-examination process is called cytology). If the sample is full of fat cells, it’s almost certainly a benign lipoma. If the cells look abnormal or don’t match what’s expected, further testing may be needed.

Lipoma vs. liposarcoma

A liposarcoma is the malignant (cancerous) version of a lipoma. It also involves fat cells, but these are abnormal cells that can grow aggressively and spread. Liposarcomas are rare, but they’re exactly why you don’t want to skip the FNA. They can look and feel similar to a benign lipoma from the outside.

Lipoma vs. lymphoma

Lymphoma in dogs affects the lymph nodes and immune system, and enlarged lymph nodes can sometimes be mistaken for lipomas – especially in the neck or armpit area. Lymph node swelling tends to feel firmer and less movable than a typical fatty lump, but again, the only way to know for sure is through FNA or a biopsy (where the vet removes a small tissue sample for lab analysis).

Infiltrative lipomas: the exception to watch for

Most lipomas sit in a tidy capsule under the skin. Infiltrative lipomas are different, they don’t stay put. Instead, they grow into the surrounding muscle and connective tissue, making them harder to remove completely and more likely to come back after surgery. They’re still technically benign (not cancerous), but they behave more aggressively. Infiltrative lipomas are more likely to appear near joints or in the armpit area, and they may cause discomfort or limit your dog’s movement.

Monitor or remove? A practical checklist for owners

Once your vet confirms a lump is a lipoma, the next question is whether to monitor it or move forward with surgical removal. There’s no universal answer, it depends on a combination of factors. Use this checklist as a starting point for your conversation with your vet:

Lean toward monitoring if:

• The FNA result clearly shows fat cells with no abnormal findings
• The lump is small (roughly golf ball-sized or smaller)
• It’s in a low-risk location (like the chest or belly) away from joints or the armpit
• It’s growing very slowly or not at all
• Your dog shows no discomfort and it doesn’t interfere with movement
• Your dog is older or has health conditions that make anesthesia riskier

Lean toward surgical removal if:

• The lump is growing noticeably faster than before
• It’s located near a joint, in the armpit, or between the legs where it can limit movement
• The FNA result was inconclusive or flagged unusual cells
• The skin over the lump is ulcerated (broken, raw, or weeping)
• Your vet suspects an infiltrative lipoma based on feel or imaging
• It’s large enough to cause discomfort or affect your dog’s quality of life
• You want it removed while your dog is younger and healthier, before anesthesia becomes a bigger risk

This isn’t a decision to make alone, bring this checklist to your vet appointment and use it to ask the right questions.

Lipoma treatment and removal cost

When surgical removal is the right call, the procedure involves putting your dog under general anesthesia and cutting out the lipoma. Recovery is typically straightforward, most dogs are back to normal within a week or two, with a follow-up visit to check the incision site.

Costs vary based on the size and location of the lipoma, your geographic area, and whether the lump is infiltrative (which makes removal more complex). As a general range, lipoma removal in dogs can run anywhere from a few hundred dollars for a small, simple lipoma to over $1,000 or more for a large or infiltrative one. The FNA itself is usually a much smaller cost, often $50–$150, and is almost always worth doing before any decisions are made.

Does pet insurance cover lipoma removal?

Vet bills for lipoma diagnosis and removal can add up fast, especially if surgery is involved. That’s where pet insurance can make a real difference.

Lemonade pet insurance can help cover the cost of diagnostics like an FNA and surgical removal of a lipoma, as long as the condition isn’t pre-existing. That last part is key: if a lipoma is already documented before your coverage starts or appears during your 14-day waiting period, it likely won’t be covered. Getting a policy in place before a lump appears is what gives you the most options.

If your dog is a breed prone to lipomas, or if they’re getting older and you know lumps may be in your future, it’s worth getting a quote sooner rather than later. Waiting until there’s already a lump on the table limits your coverage.

Before we go

Finding a lump on your dog is scary, full stop. But most of the time, a soft, movable lump on an older dog turns out to be exactly what it looks like, a benign fatty tumor that can be monitored or removed with a routine procedure. The most important thing you can do right now is call your vet and get that lump checked.

And if you’re thinking about pet insurance, now is the right time to look into it, before a diagnosis turns a coverable condition into a pre-existing one. You can get a Lemonade pet insurance quote in minutes.

Frequently Asked Questions

A few quick words, because we <3 our lawyers: This post is general in nature, and any statement in it doesn’t alter the terms, conditions, exclusions, or limitations of the policies issued, which differ according to your state of residence. You’re encouraged to discuss your specific circumstances with your own professional advisors. The purpose of this post is merely to provide you with info and insights you can use to make such discussions more productive! Naturally, all comments by, or references to, third parties represent their own views, and Lemonade assumes no responsibility for them. Coverage may not be available in all states. Please note that statements about coverages, policy management, claims processes, Giveback, and customer support apply to policies underwritten by Lemonade Insurance Company or Metromile Insurance Company, a Lemonade company, sold by Lemonade Insurance Agency, LLC.  The statements do not apply to policies underwritten by other carriers.