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Dog Lipoma

Lipoma is a benign mass made up of fat cells. It is the “lump” most frequently discovered under the skin of adult or elderly dogs. It typically presents as a soft, flexible, mobile mass under the fingers, painless, which grows slowly, often...

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Definition Signs Causes Diagnosis Treatment Prevention Complications When to see a vet Prognosis FAQ Sources Affected species

What is it?

Lipoma is a benign mass made up of fat cells. It is the “lump” most frequently discovered under the skin of adult or elderly dogs.

It typically presents as a soft, flexible, mobile mass under the fingers, painless, which grows slowly, often on the thorax, stomach, sides or upper legs.

A lipoma does not turn into cancer and does not endanger the dog's life.

Key point

A soft, mobile mass is NOT necessarily a lipoma. A mastocytoma, a malignant tumor, can have exactly the same consistency. Don't be fooled by appearance or the absence of pain: a quick and inexpensive fine needle puncture is the only way to know.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Related signs — each one links to its page:

Nodules under the skin Swelling Weight gain

Rounded or oval mass under the skin, soft, which rolls under the fingers.

Slow growth, over months or years.

Absence of pain, redness and itching.

The dog shows no general signs: he eats, plays and sleeps normally.

Sometimes several masses distributed over the body.

When a lipoma is located in an armpit or groin crease, it can interfere with the movement of the limb and cause discomfort when walking.

A mass that becomes hard, painful, hot, adheres to deep tissues, or grows rapidly does not correspond to a lipoma and should be re-examined immediately.

When to consult without delay

This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.

Causes and risk factors

The fat cells multiply locally and form a circumscribed mass.

The exact reason for this proliferation is not known.

Age and overweight are associated with a higher frequency, without a direct cause and effect link being demonstrated.

Middle to advanced age.

Overweight and obesity.

Frequently affected breeds: Labrador, Doberman, Schnauzer, Dachshund, Cocker Spaniel, as well as many crosses.

Females seem a little more affected.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

The veterinarian palpates the mass, assesses its consistency, mobility and adhesion to deep planes, and examines the rest of the body for other masses.

The fine needle puncture is the decisive examination: quick, not very painful, carried out in consultation with a watchdog, it takes a few cells which are observed under a microscope. The result distinguishes a lipoma from a mastocytoma or other tumor.

This simple examination is the best investment in the management of a lump: it avoids both unnecessary surgery and delay in an aggressive tumor.

If the mass is deep, adherent, or unusual in appearance, imaging or biopsy is suggested.

It is useful to note the position and size of each mass, for example on a diagram, to follow their evolution from one visit to the next.

Treatment

A confirmed lipoma, small and not bothersome, does not require any treatment: simple monitoring is enough.

Surgical removal is indicated when the mass hinders movement, is located in an armpit or fold, grows quickly, ulcerates, or when the diagnosis remains uncertain.

Some forms infiltrate between muscles and are more difficult to remove completely; they justify more extensive surgery.

No diet, cream or supplement will make a lipoma disappear. Weight loss in an obese dog can, however, improve general comfort and facilitate monitoring of masses.

Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.

Prevention

There is no way to prevent the appearance of lipomas.

Maintaining a healthy weight and regular activity remains beneficial for overall health and makes lumps easier to spot.

Running your hands over your dog's entire body once a month helps detect new masses early and track existing ones.

Show any new lumps to the veterinarian, even in a dog that already has several: a suspicious mass may appear among benign lipomas.

Possible complications

Mechanical discomfort when the mass develops in an armpit, a fold of the groin or against a joint: the dog may limp or change its gait.

Mass that has become too large to be simply removed, which would have been easy earlier.

Infiltrative forms which creep between the muscles and recur after surgery.

Main risk: mistaking a malignant tumor with an identical appearance for a lipoma, and wasting time.

When to see a veterinarian

You discover a new lump under your dog's skin: have it examined, even if it seems soft and innocuous.

A known mass grows quickly, hardens, or becomes painful.

The skin above becomes red, hot, or ulcerates.

The mass interferes with walking or the movement of a leg.

Your dog loses weight, gets tired or loses his appetite while carrying masses: consult without delay.

Prognosis

Excellent. A confirmed lipoma is benign: it does not invade the organs, does not spread or shorten the dog's life.

Many dogs live for years with several lipomas without any consequences.

When removal is necessary for comfort, healing is usually straightforward.

Frequently asked questions

It's soft and it moves under the fingers: it's benign, right?

Unfortunately, consistency doesn't say anything reliable. Some malignant tumors, particularly mastocytoma, are also soft and mobile. This is precisely why veterinarians recommend puncturing any new mass rather than classifying it based on its appearance.

Should we operate on all lipomas?

No. A confirmed lipoma, small and well placed, can simply be monitored. The operation is justified if it hinders movement, if it grows quickly, if it is poorly placed (armpit, groin) or if the diagnosis is not certain.

My dog has several, should I remove them all?

This is usually not necessary. The important thing is to spot them, note their position and size, and report any changing masses or new arrivals: this is the one that should be checked.

Can a lipoma become cancerous?

A lipoma does not turn into cancer. On the other hand, there is a rare malignant tumor distinct from fat cells, as well as infiltrating lipomas which remain benign but grow between the muscles. This is yet another reason to have the diagnosis confirmed once and for all.