Lipoma (Fatty Tumor) in Dogs: Symptoms, Treatment & When to Worry

Disclaimer: This article is for informational purposes only and does not replace professional veterinary advice. Always consult your veterinarian for diagnosis and treatment of your pet.

A lipoma is a benign fatty tumor made of mature fat cells. These soft, movable lumps are common in middle-aged and older dogs and are usually harmless. While lipomas don’t spread or become cancerous, it’s important to have any new lump checked by your veterinarian to confirm the diagnosis.

What Is a Lipoma?

A lipoma is a non-cancerous growth of fat cells that develops under the skin. It typically feels soft, movable, and often round or oval. Lipomas grow slowly and don’t invade surrounding tissues or spread to other parts of the body. They are one of the most common skin masses in dogs and are generally considered benign.

• Benign (non-cancerous) fatty tumor
• Soft, movable, usually under the skin
• Often seen in overweight or middle-aged dogs
• Rarely requires treatment unless causing discomfort

Symptoms of Lipoma in Dogs

Early Signs

• Soft lump under the skin: Usually discovered during petting or grooming
• Movable mass: Slips easily when gently pushed
• No pain or discomfort: Most dogs show no signs of pain
• Slow growth: The lump may gradually increase in size over months or years
• Single or multiple: Dogs can have one or several lipomas in different areas

Progressive Symptoms

• Larger size: Big lipomas may become more noticeable or cumbersome
• Location-related issues: Lipomas in the armpit, groin, or between legs may cause mild mobility issues
• Pressure on surrounding structures: Very large lipomas might affect movement or comfort
• Multiple lipomas: Some dogs develop numerous lipomas (lipomatosis)

Emergency Signs

Lipomas themselves rarely cause emergencies. However, seek immediate veterinary care if:

• The lump becomes firm, fixed, or irregular
• The mass grows rapidly
• The area becomes red, hot, painful, or ulcerated
• Your dog shows loss of appetite, lethargy, or difficulty moving

What Causes Lipomas in Dogs?

The exact cause is not fully understood. Possible factors include:

• Age: Middle-aged and older dogs are more commonly affected
• Weight: Overweight dogs may be more prone to lipomas
• Breed predisposition: Certain breeds develop lipomas more frequently
• Genetics: Some dogs may have a hereditary tendency
• Metabolic factors: Hormonal or metabolic influences may play a role

Breeds Most at Risk

• Labrador Retrievers
• Doberman Pinschers
• Miniature Schnauzers
• Golden Retrievers
• Cocker Spaniels
• mixed-breed dogs (especially those with above breed ancestry)

How Lipomas Are Diagnosed

Diagnosis typically involves:

1. Physical examination: Your vet will assess the lump’s size, texture, mobility, and location.
2. Fine-needle aspiration (FNA): A small needle withdraws cells from the mass. Lipomas typically yield clear, oily fluid or fat cells with a characteristic appearance.
3. Biopsy: If the mass is atypical (firm, fixed, fast-growing), a biopsy may be recommended to rule out liposarcoma (a malignant fatty tumor).
4. Imaging: For deeply located masses, ultrasound or other imaging may help evaluate extent and relationship to surrounding structures.

Treatment Options for Lipoma

Medical Management

• Observation: Most lipomas require no treatment. Your vet may recommend monitoring for size, texture, or behavioral changes.
• Weight management: Keeping your dog at a healthy weight may help reduce the size of some lipomas or slow new ones from forming.

Surgical Options

• Surgical removal: Considered if the lipoma:

• Recurrence: Lipomas can recur in the same area, and new ones may develop elsewhere. Surgery is not a guarantee against future lipomas.

Alternative/Supportive Therapies

• Acupuncture or physical therapy: May help with comfort if the lipoma affects mobility
• Monitoring: Regular rechecks to ensure the mass remains typical for a lipoma

At-Home Care

• Avoid squeezing or traumatizing the lump
• Monitor for changes in size, shape, firmness, or your dog’s comfort
• Report any changes to your veterinarian
• Maintain a healthy weight through diet and exercise

Prognosis & Life Expectancy

• Lipomas are benign and do not affect life expectancy.
• Most dogs with lipomas live normal, healthy lives.
• Rarely, a liposarcoma (malignant fatty tumor) may be mistaken for a lipoma; biopsy confirms the diagnosis when there is doubt.

Prevention

There is no proven way to prevent lipomas. You can:

• Keep your dog at a healthy weight
• Perform regular skin checks and report new lumps promptly
• Schedule routine wellness exams for early detection

Cost of Treatment

• Diagnosis (FNA): $50–$150
• Biopsy (if needed): $200–$500+
• Surgical removal: $300–$1,500+ depending on size and location
• Monitoring/rechecks: Usually included in routine exam fees

Frequently Asked Questions