Lipomas in Dogs and Pain: Should I worry about my dog being in pain?

Finding a lump on your dog can be alarming. One of the most common causes of soft, fatty lumps in older dogs is a lipoma. Middle aged and older overweight female dogs are particularly predisposed to developing lipomas. While many lipomas are harmless, pet owners often wonder whether these growths can eventually affect movement or become painful.

It’s important to remember that not all lumps found on dogs are dangerous or cancerous. Some lipomas can interfere with mobility or cause discomfort depending on their size, location, and type. Understanding when a lipoma is harmless and when it may need veterinary attention can help you make the best decisions for your dog’s comfort and health.

What Is a Lipoma in Dogs?

A lipoma is a benign (non cancerous) tumor made up of fat cells. They are usually soft, round, and movable under the skin. Lipomas are especially common in middle aged and senior dogs, and certain dog breeds may be more prone to developing lipomas.

Lipoma development is influenced by genetic, environmental, and hereditary factors, and certain dog breeds, including cocker spaniels, are more susceptible to developing lipomas. The exact cause of developing lipomas in dogs is not fully understood, but factors such as age, obesity, genetics, and gender may play a role.

Most lipomas grow slowly and do not spread to other parts of the body. Many dogs live comfortably with small lipomas for years without any treatment.

Are Lipomas Painful for Dogs?

In many cases, lipomas are benign tumors and themselves are not painful. A typical fatty lump under the skin usually does not bother a dog when touched. However, if a lipoma grows large or is located in a spot that affects your pet's condition (such as pressing on nerves, joints, or organs) it can lead to discomfort or pain.

Large Lipomas

As a lipoma grows, it can place pressure on nearby muscles, nerves, or joints. Because lipomas can develop anywhere on a dog's body, monitoring a lump's size in different locations is important for detecting changes that may affect your dog's comfort or mobility. Large lipomas may feel heavy or awkward for the dog, especially if they are located around the chest, legs, or belly.

Dogs with larger lipomas may show signs such as reluctance to walk or run, difficulty climbing stairs, stiffness after resting and trouble getting comfortable while lying down.

Lipomas Near Joints

Lipomas that develop near the shoulder, elbow, hip, or knee can physically interfere with movement. Even if the lump itself is not painful, it may limit the dog’s range of motion. In particular, infiltrative lipomas that grow between muscle layers can affect mobility by interfering with normal movement, especially when located near joints.

For example, a lipoma under the front leg or in the armpit area may rub against tissues while the dog walks, causing irritation over time.

Infiltrative Lipomas

Not all lipomas stay neatly contained within the fatty tissue layer beneath the dog's skin. Some dogs develop infiltrative lipomas (McChesney et al., 1980), which can extend beyond this layer and grow rapidly into surrounding muscles and connective tissues. These are still technically benign, but they behave more aggressively than standard lipomas.

Infiltrative lipomas are more likely to:

• Cause pain

• Restrict mobility

• Return after removal

• Require surgery or additional treatment

Because they invade deeper tissues and may grow rapidly, they can become much more problematic than ordinary fatty tumors (Kramek et al., 1985).

Can Lipomas Affect a Dog’s Movement?

Yes, lipomas can absolutely affect movement in some dogs. The impact largely depends on the lump’s location and size. Dogs with multiple lipomas may be at greater risk for mobility issues, especially if several lumps develop in areas critical for movement (Pengram et al., 2020).

Common Problem Areas

Certain locations are more likely to create mobility problems:

Simple lipomas are commonly found on a dog's tummy, chest, or abdomen. These benign, soft, and movable fatty tumors typically develop just under the skin and are usually not painful.

Under the Front Legs

Lipomas in the armpit region can interfere with the natural motion of the legs. Dogs may begin taking shorter steps or develop an unusual gait.

Inner Legs or Groin

Fatty tumors between the legs may rub during walking and make movement uncomfortable.

Chest and Abdomen

Large lipomas hanging from the chest or belly can alter balance and make exercise tiring.

Neck or Shoulder Area

Growths near the neck or shoulders may limit turning, stretching, or comfortable sleeping positions.

Signs a Lipoma May Be Causing Problems

It can sometimes be difficult to tell whether a lipoma is truly affecting your dog. Watch for these warning signs:

• Limping

• Slower walks

• Hesitation when jumping

• Reduced activity levels

• Sensitivity when the lump is touched

• Trouble standing up

• Changes in posture or gait

• Excessive licking around the lump

Regular veterinary checkups are essential for monitoring your pet's health, overall health, and well-being, especially when managing lipomas. If you notice any of these symptoms, it’s a good idea to schedule a veterinary examination.

How Veterinarians Diagnose Lipomas

Although many fatty lumps are harmless lipomas, not every lump should automatically be assumed benign. When a veterinarian encounters a suspected lipoma, obtaining an accurate diagnosis is essential to distinguish it from other tumors in dogs and to address any real concern about malignancy. Your veterinarian will likely recommend testing to confirm the diagnosis (Pengram et al., 2020).

Fine Needle Aspiration (FNA)

A fine needle aspirate is one of the most common diagnostic methods, where a small needle is inserted into the lump to collect a sample that is then examined under a microscope for the presence of tumor cells.

Biopsy

In some cases, a tissue sample may be needed to rule out more serious tumors.

Imaging Tests

For deeper or infiltrative lipomas, X-rays, ultrasounds, CT scans, or MRIs may help determine how far the growth extends into surrounding tissues.

When Should a Lipoma Be Removed?

Not every lipoma requires surgery. Many veterinarians recommend simply monitoring small, non-problematic lumps. However, surgical removal is often the best treatment for lipomas that cause pain, interfere with movement, or grow rapidly. Veterinarians may recommend surgical removal or other treatment options depending on the size, location, and recurrence risk of the tumor. Removal may be advised if the lipoma interferes with movement, continues growing rapidly, causes pain or irritation, becomes infected or ulcerated, develops in a difficult location, or is suspected to be infiltrative.

Early removal is often easier than waiting until the lipoma becomes very large. Smaller growths are generally easier to surgically remove.

Surgery and Recovery

Lipoma removal surgery is usually straightforward for standard fatty tumors. Most dogs recover well within a couple of weeks.

After surgery, dogs may need:

• Restricted activity

• Pain medication

• A protective cone

• Follow up appointments

Recovery can take longer if the lipoma was deeply embedded or infiltrative. In cases where infiltrative lipomas recur after surgery, radiation therapy may be considered as a follow up treatment.

Can Lipomas Come Back?

Standard lipomas removed completely often do not return. However, dogs that are prone to lipomas may develop new ones in different locations over time.

While most lipomas do not shrink on their own, weight loss can sometimes help lipomas shrink or reduce the risk of new ones forming by maintaining a healthy weight and lifestyle.

Infiltrative lipomas have a higher chance of recurring because they can be difficult to remove entirely.

Are Lipomas Preventable?

There is no guaranteed way to prevent lipomas, but maintaining a healthy weight may help reduce the risk or slow growth. Obesity is associated with increased fatty tissue, and overweight dogs may be more likely to develop large lipomas. Drug interactions, along with genetics and environmental factors, may also contribute to developing lipomas in the fatty tissue layer beneath the skin.

Helpful habits include:

• Regular exercise

• Balanced nutrition

• Routine veterinary checkups

• Monitoring new lumps early

Keeping track of lump size with photos or measurements can also help you notice changes quickly.

Certain nutritional supplements may help support healthy fat metabolism, reduce oxidative stress, and modulate chronic low grade inflammation, all of which are thought to play a role in the development of lipomas in some dogs. Omega-3 fatty acids from fish oil (Bauer, 2011) are commonly used to help regulate inflammatory pathways, while antioxidants such as vitamin E and curcumin may help protect tissues from oxidative damage. Functional mushroom supplements containing species such as Turkey Tail, Reishi, and Lion's Mane are increasingly being explored for their immunomodulatory and anti inflammatory properties due to their beta glucans and triterpenes. Some veterinarians and pet owners also use medicinal mushrooms to support metabolic health, liver function, and cellular repair processes that may indirectly help reduce conditions favorable to fatty mass formation. While no supplement has been definitively proven to prevent lipomas, maintaining a healthy body condition, reducing inflammatory burden, and supporting overall metabolic resilience through diet and targeted supplementation may be beneficial as part of a long term wellness strategy.

Should You Worry About Every Lump?

Not every lump is dangerous, and most are benign lipomas, but every new lump should be checked by a veterinarian. Dog owners should be aware that, while benign lipomas are common and generally harmless, in rare cases, rapid growth or unusual features may indicate a more serious problem. Some malignant tumors can initially feel similar to lipomas.

It’s especially important to have a lump examined if it grows rapidly, feels firm or attached, changes shape, causes pain, appears suddenly or ulcerates/bleeds.

Early evaluation provides peace of mind and helps catch serious conditions sooner.

Helping Your Dog Stay Comfortable

If your dog already has a lipoma affecting mobility, there are several ways to improve comfort:

• Use orthopedic dog beds

• Avoid excessive jumping

• Maintain a healthy body weight

• Take shorter, gentler walks

• Consider physical therapy if recommended by your vet

Some dogs with mild mobility issues benefit from supplements or low-impact exercise like swimming. Always seek professional guidance from a veterinarian regarding your dog's lipoma, as the suggestions provided here are for informational purposes only and do not constitute medical advice.

Things to keep in mind

Lipomas are common in dogs and are often harmless, but they should never be completely ignored. While many fatty tumors remain small and painless, others can interfere with movement, create discomfort, or grow into deeper tissues.

The good news is that veterinarians can usually diagnose lipomas easily and recommend the best course of action. Monitoring your dog closely and addressing mobility changes early can help keep them comfortable and active for years to come.

If you notice a lump that seems to affect your dog’s walking, posture, or comfort, scheduling a veterinary checkup is the safest next step.

References

Bauer, J. E. (2011). Therapeutic use of fish oils in companion animals. Journal of the American Veterinary Medical Association, 239(11), 1441-1451.

Kramek, B. A., Spackman, C. J., & Hayden, D. W. (1985). Infiltrative lipoma in three dogs. Journal of the American Veterinary Medical Association, 186(1), 81-82.

McChesney, A. E., Stephens, L. C., Lebel, J., Snyder, S., & Ferguson, H. R. (1980). Infiltrative lipoma in dogs. Veterinary Pathology, 17(3), 316-322.

Pegram, C. L., Rutherford, L., Corah, C., Church, D. B., Brodbelt, D. C., & O'Neill, D. G. (2020). Clinical management of lipomas in dogs under primary care in the UK. The Veterinary Record, 187(10), e83.