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Lipoma in Dogs

Lipoma in Dogs

It's always concerning to find an unusual lump on your dog, but not all of them, including lipomas, are cause for concern. Today, our Newtown vets discuss lipomas in dogs including their causes and treatment options.

Lipoma in Dogs

Frequently seen in middle-aged and senior dogs, simple lipomas are painless, soft, and mobile lumps made up of fat cells. Although most often found on the abdomen and chest these lumpy masses can develop anywhere, just under the skin, on your dog's body. 

Several breeds seem to be more susceptible to developing lipomas including Weimaraners, Labs, Cocker Spaniels, Dachshunds, Beagles, Miniature Schnauzers, and Dobermans. Female dogs that are overweight are also more prone to lipomas.

There are 3 types of lipomas seen in dogs:

Simple Lipoma

Simple lipomas develop in the fatty tissue layer found under your dog's skin and tend to grow slowly. They are movable and do not cause your dog any discomfort or pain. This type of lipoma is typically found on the dog's tummy, chest, or abdomen.

Infiltrative Lipoma

This type of lipoma can be firm and fixed in place or soft and mobile and tends to be 'locally aggressive', meaning that it may spread to surrounding tissues. In some cases, these lipomas grow between muscle layers which can lead to discomfort.


Myelolipomas are also benign, but these tumors are made up of fat cells and hematopoietic cells and typically develop on the dog's adrenal glands, liver, or spleen.

Diagnosing a Lipoma

If your dog develops a lump or bump, it is extremely important to book an appointment with your vet to have it investigated. While your dog's lump may be a harmless lipoma, if the lump does turn out to be a form of cancer, early detection and treatment are essential for good treatment outcomes. 

Lipomas are characterized as small, hemispherical lumps that can be felt just under your dog's skin. The lump will likely feel somewhat soft and you will be able to move it a little, although it's important to keep in mind that firmer, stationary lipomas are also fairly common.

Your vet will perform a fine needle aspiration, to suction out a sample of cells which will be examined under a microscope by a veterinary pathologist. If your pup's results are unclear, your vet may recommend a biopsy or histopathology to determine a more clear diagnosis of your pet's condition.

Causes of a Lipoma in Dogs

Lipomas are thought to occur due to several factors including diet, genetics, chemicals in the environment, drug interactions, and more. Although it may not be possible for your vet to determine the cause of your dog's lipoma, maintaining your dog's weight at a healthy level may help to prevent lipomas from occurring.

Growth of a Dog's Lipoma

While these fatty tumors are not malignant and will not metastasize (spread to other parts of your dog's body), they may continue to grow and start to cause discomfort depending on their location.

Each dog is unique and lipomas can grow at varying rates. While many grow very slowly, and may never become a real concern, others will grow rapidly and may become problematic.

Treatment for a Dog Lipoma

The need for treatment will be determined on a case-by-case basis. Since most lipomas grow slowly, your vet may suggest simply monitoring the lump for changes. If it suddenly begins to grow, becomes painful for your dog, or changes texture, let your vet know right away.

If your dog's lipoma is in an uncomfortable location, such as near a joint, your vet may recommend having the lump surgically removed.

Infiltrative lipomas can prove more challenging to remove since they typically grow quickly and surround nearby tissues leading to discomfort for your pup. Your vet may recommend surgery to remove as much of the lipoma as possible followed by radiation therapy to deal with the remaining lipoma tissue.

In some cases lipomas can be treated by injecting the lump with a steroid to help shrink the tumor, however many lipomas return in as little as 6 months when this treatment is used.

Speak to your vet to determine the best treatment for your canine companion.

Note: The advice provided in this post is intended for informational purposes and does not constitute medical advice regarding pets. For an accurate diagnosis of your pet's condition, please make an appointment with your vet.

Have you noticed a concerning lump somewhere on your dog's body? Contact our Newtown vets today to have your pup diagnosed and treated as necessary.

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