You may first notice one while rubbing your dog’s belly or running your hands along their chest, sides or legs. Lipomas often grow slowly and cause no obvious discomfort, which makes them easy to miss until they reach the size of a grape or walnut.
Most confirmed lipomas only need to be monitored. The important first step is having any new lump examined by your veterinarian so you know what it is, where it is located and whether it is changing over time.
The Lump That Probably Isn’t a Big Deal (But Still Needs a Look)
Here’s the reassuring part: the most common reason older dogs develop new lumps under the skin is a lipoma, a benign growth made of fat cells.[1] Lipomas tend to be soft, move around a bit when you press on them, and don’t seem to bother the dog at all. They show up most often on the chest, belly, sides, or upper legs, basically anywhere there’s a decent layer of fat under the skin.[1]
They’re also fairly common. A large UK study tracking nearly 400,000 dogs found that about 2% develop a diagnosed lipoma in a given year, with the odds climbing noticeably in dogs at or above their breed’s typical adult weight.[2] So if your dog is on the heavier side, or getting up there in years, a fatty lump landing on the radar isn’t unusual at all. Our Bernie’s University article about lipomas in dogs goes into more depth on why fat tissue behaves this way as dogs age.
Why “It Feels Like a Lipoma” Isn’t the Same as “It Is One”
Here’s the tricky part, though. A soft, squishy, movable lump can be a lipoma. It can also be something else that happens to feel similar from the outside. Certain other masses, including some early mast cell tumors, a type of cancer and tumors in dogs, can mimic a fatty lump closely enough that visual and physical signs alone aren’t enough to tell them apart.[1]
That’s why feeling around at home is a useful starting point, but not a diagnosis. The only real way to know what a lump actually is comes from a fine needle aspirate, a quick, minimally invasive procedure where your vet uses a small needle to pull a tiny sample of cells and look at them under a microscope, usually during a regular appointment.[1] It’s the difference between “probably fine” and “confirmed fine.”
Or maybe your vet takes one look, feels how classically lipoma-like it is, and still recommends the aspirate anyway. That’s not your vet being overly cautious. That’s just how these things get ruled in or out.
Signs Worth Flagging Sooner Rather Than Later
Most lipomas, once identified, simply get monitored. But a few patterns are worth mentioning at your dog’s next appointment, or sooner if you notice them:[1][3]
- A lump that’s grown noticeably in the past few weeks
- A lump that feels firm or fixed in place, rather than soft and movable
- Redness, warmth, or skin changes over the lump
- A lump your dog seems sensitive about when touched
- Any new lump that shows up between regular exams
None of these automatically mean something serious. Plenty of harmless lumps grow a little over time or sit in an odd spot that makes them feel firmer than they are. But changes like these are the kind of thing a vet should look at directly rather than something to track and wonder about for months.
Location matters too. A small lipoma tucked along the ribs might never cause a problem. One that develops near the armpit, groin, or the crook of a leg has a better chance of getting in the way as your dog moves, simply because that’s a spot the body relies on for flexibility. This guide to Early Signs of Joint Issues in Dogs can help you separate a lump-related change in movement from a joint-related one, since the two can look similar from across the room.
Weight, Joints, and the Rest of the Picture
Fat tissue isn’t just passive padding. It responds to a dog’s body condition, and that same study found that dogs carrying more weight than their breed average had close to double the odds of developing a lipoma.[2] Maintaining an appropriate body weight through diet and regular movement won’t make an existing lipoma disappear, but it’s one of the few things a dog parent actually has some influence over, and it tends to pay off in other ways too.
That’s not surprising, since weight and joint comfort tend to be closely connected for a lot of senior dogs. Extra weight means extra load on hips, knees, and shoulders with every step, every jump onto the couch, every trip up the stairs.
A dog carrying a lipoma near the shoulder or hip is already dealing with one thing taking up space in a high-use area. Add some extra pounds on top of stiff or aging joints, and comfortable, confident movement gets harder to come by. Healthy weight management is an important consideration for whole dog health, no matter the breed or age.
For a lot of senior dogs, that’s where joint support earns its place in the daily routine, less about any one lump and more about keeping the whole system moving comfortably as the years add up. Stiffness alongside a new lump is worth mentioning at the same appointment, since the two often get monitored together at senior wellness visits.
Supporting Your Dog Through the Senior Years
Finding a new lump is a reminder to pay closer attention, not a reason to panic. Have it checked, note its size and location, and watch for changes in how your dog moves, eats and feels day to day.
When we formulate our products, we keep our senior friends in mind. Bernie’s OMG! Omegas provides healthy omega-3 fats to support the skin, coat, joints and overall wellness. Bernie’s Healthy Hips supports joint comfort and mobility through every life stage. Bernie’s Perfect Poop supports digestion and nutrient utilization, helping dogs make the most of the food they eat.
These products are not specifically intended to address fatty lumps, but to support whole dog health, which is the whole idea behind how Bernie’s Best approaches formulation. They support the everyday systems that can become more important as dogs age, from comfortable movement to steady digestion and foundational nutrition.
Caring for Senior Dogs with Fatty Lumps
For many senior dogs, a confirmed lipoma becomes one more thing to check from time to time rather than something that changes daily life. Keep a simple record of where it is, about how large it feels and whether it begins affecting the skin or your dog’s movement. Any new lump should still be evaluated on its own, even if your dog already has one or more confirmed lipomas.
Senior care often comes down to noticing small changes early. A different gait, a shift in appetite, trouble getting comfortable or a lump that feels different than it did last month can all be useful information for your veterinarian. Regular exams and familiar hands at home work together to create a clearer picture of how your dog is doing.
You know the shape of your dog’s body and the rhythm of their day better than anyone. That familiarity becomes especially valuable with age. Keep checking in, keep asking questions and keep supporting the routines that help your senior friend stay comfortable, active and fully part of family life.
Frequently Asked Questions
Is a fatty lump on my senior dog dangerous? Most fatty lumps in older dogs turn out to be lipomas, which are benign and typically don’t affect a dog’s health. That said, some other types of masses can look and feel similar from the outside, so any new lump should be checked by a vet rather than assumed to be harmless.
Can I tell if it’s a lipoma just by feeling it? Not with full certainty. Lipomas tend to feel soft and movable, but so can a few other types of masses. A fine needle aspirate, a quick in-office procedure, is the only way to confirm what a lump actually is.
Do lipomas need to be removed? Not usually. Once a vet has evaluated a lipoma and confirmed what it is, most are simply monitored over time. Removal tends to come up if a lipoma grows quickly, becomes firm or fixed, or starts interfering with a dog’s movement, especially if it’s in a spot like the armpit, groin, or leg.
Are certain dogs more likely to get lipomas? Yes. They’re more common in middle-aged and senior dogs, and research has found higher rates in Weimaraners, Doberman Pinschers, German Pointers, Springer Spaniels, and Labrador Retrievers, along with dogs carrying extra body weight [2].
Should I be worried if my dog already has a few lipomas and a new one shows up? Not necessarily worried, but it’s still worth a vet visit. Having lipomas before doesn’t automatically mean a new lump is the same thing. Each new lump deserves its own look.
References
[1] Villalobos AE. “Tumors of the Skin in Dogs.” Merck Veterinary Manual, Dog Owners edition. Last updated April 2026. https://www.merckvetmanual.com/dog-owners/skin-disorders-of-dogs/tumors-of-the-skin-in-dogs
[2] O’Neill DG, Corah CH, Church DB, Brodbelt DC, Rutherford L. “Lipoma in dogs under primary veterinary care in the UK: prevalence and breed associations.” Canine Genetics and Epidemiology, 2018;5:9. https://link.springer.com/article/10.1186/s40575-018-0065-9
[3] Villalobos AE. “Connective Tissue Tumors in Animals.” Merck Veterinary Manual, Integumentary System, Professional edition. Last updated September 2024. https://www.merckvetmanual.com/integumentary-system/tumors-of-the-skin-and-soft-tissues/connective-tissue-tumors-in-animals
