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What is lipoma in dogs?

What is lipoma in dogs?

A lipoma is a common, benign tumor made of fat cells that develops under a dog's skin, typically in older or overweight dogs. These lumps are usually soft, slow-growing, and painless, but may require removal if they interfere with movement or comfort.

Understanding Lipoma in Dogs: Causes, Symptoms, and Care

Lipomas are among the most common lumps that dog owners discover under their pet's skin. These benign tumors, composed of fat cells, can cause concern, but they're typically harmless and slow-growing. Let's explore what lipomas are, why they form, and how to manage them if your dog develops one.

What Is a Lipoma?

A lipoma is a non-cancerous (benign) tumor made up of fat cells. You'll usually find them just beneath the skin, although they can develop anywhere fat is present in the body. They most often appear in middle-aged to older dogs, and certain breeds seem more susceptible. Lipomas are soft, round, and movable, and they generally grow slowly. Most are painless, but a rare type called an infiltrative lipoma can feel firmer and be less mobile under the skin.

Where Do Lipomas Appear?

These fatty lumps can show up almost anywhere, but they're most commonly found on the:

Chest
Abdomen
Limbs
Back

Some dogs may develop multiple lipomas at once, and the size can range from a small pea to a large, noticeable mass.

Are Lipomas Dangerous?

Most lipomas are harmless and don't spread to other parts of the body. However, they can keep growing, and if they become large or are located in awkward spots (like the armpit or groin), they might interfere with your dog's movement or comfort. In very rare cases, a malignant form called liposarcoma can develop, which is more invasive and may require aggressive treatment, though it seldom spreads to distant organs.

Who Is at Risk?

Several factors can increase a dog's risk for developing lipomas:

Age: Most common in dogs over seven years old
Obesity: Overweight dogs are more susceptible
Breed: Labrador Retrievers, Dobermans, Cocker Spaniels, Weimaraners, Dachshunds, and Miniature Schnauzers
Gender: Females are slightly more prone
Genetic predisposition
Spaying or neutering
Trauma or injury
Hypothyroidism

If your dog fits any of these categories, it's wise to be extra vigilant about checking for lumps.

Recognizing a Lipoma

The classic sign is a soft, round, and movable lump under the skin. Most lipomas don't cause pain unless they're pressing on nerves or restricting movement. The skin over the lump usually looks normal. If you notice a lump that's growing quickly, feels firm, or changes in appearance or texture, it's time to see your veterinarian.

How Are Lipomas Diagnosed?

Your veterinarian will start with a physical examination, feeling the lump and checking its characteristics. To confirm it's a lipoma (and not something more serious), they may perform:

Fine Needle Aspiration (FNA): Collecting cells from the lump with a thin needle for microscopic evaluation.
Biopsy: Removing a small tissue sample if the FNA is inconclusive.
Imaging (CT scans): Used for deep or infiltrative lipomas to assess their extent.

This thorough approach ensures that malignant tumors aren't missed and that your dog gets the right care.

Treatment Options for Lipoma in Dogs

Most lipomas don't require treatment unless they're causing problems. Your vet may recommend removal if the lump:

Grows rapidly
Causes discomfort or pain
Restricts movement or daily activity
Has an uncertain diagnosis

Surgical removal is the most effective option for problematic lipomas. Simple lipomas are usually cured by surgery. Infiltrative lipomas or liposarcomas might recur and could need additional surgery or radiation therapy. After surgery, most dogs recover within about a week. Your vet will advise you on how to monitor the site and watch for recurrence.

Can You Prevent Lipomas?

There's no guaranteed way to prevent lipomas. However, keeping your dog at a healthy weight with proper diet and regular exercise may help reduce the risk or limit the number and size of these tumors. There's no evidence that home remedies or supplements can reliably shrink or prevent lipomas—always discuss any treatment options with your veterinarian.

When Should You See a Veterinarian?

If you find any new lump on your dog—especially one that's growing quickly, changing shape or texture, or causing pain—schedule a veterinary visit. Even though most lipomas are harmless, only your vet can rule out more serious conditions like cancerous tumors.