Canine Lipoma: Understanding Fatty Tumors in Dogs
Understanding Canine Lipoma in Dogs: Causes, Diagnosis, and Treatment
By Dr. Roger Hart, Bushnell Animal Clinic
Discovering a lump under your dog’s skin can be alarming. Many pet owners immediately worry about cancer or a serious illness. Fortunately, one of the most common causes of lumps in dogs is something far less dangerous: a canine lipoma.
At Bushnell Animal Clinic, we frequently evaluate dogs with lumps and bumps, and lipomas are among the most common findings. Understanding what these fatty tumors are, how they develop, and when treatment is necessary can help pet owners feel more confident about their dog’s health.
In this article, Dr. Roger Hart explains everything pet owners should know about canine lipomas—from causes and diagnosis to treatment options and prevention.
What Is a Canine Lipoma?
A lipoma is a benign (non-cancerous) tumor made up of fat cells that forms beneath the skin or sometimes deeper within the body.
Lipomas are extremely common in dogs, particularly in middle-aged and older pets. These growths typically appear as soft, slow-growing lumps under the skin and are usually painless.
In most cases, lipomas are harmless and may not require treatment unless they become large or interfere with a dog’s movement.
Common Locations for Lipomas
Lipomas can develop anywhere fat cells exist, but they are most often found:
Chest
Abdomen
Back
Legs
Flanks
Neck
These lumps usually feel soft, movable, and well-defined under the skin, which is one of the key signs veterinarians use to suspect a lipoma during an exam. (Why Do Dogs Get Lipomas?
The exact cause of lipomas in dogs is not fully understood. However, veterinary research has identified several factors that increase the likelihood of developing these fatty tumors.
1. Age
Lipomas are far more common in middle-aged and senior dogs, often appearing after age seven.
2. Obesity
Dogs that are overweight or obese are more likely to develop lipomas. Excess body fat may contribute to the formation of fatty tumors.
3. Genetics
Certain breeds are more prone to lipomas, including:
Labrador Retrievers
Golden Retrievers
Doberman Pinschers
Cocker Spaniels
4. Hormonal Factors
Studies suggest lipomas may occur more often in spayed or neutered dogs, though the exact reason is still unclear.
5. Natural Aging Process
Some veterinarians believe lipomas are simply part of aging for many dogs, as fatty growths become more common later in life. What Does a Lipoma Feel Like?
Many pet owners first notice a lipoma while petting or grooming their dog. The lump often has distinctive characteristics.
Typical Lipoma Characteristics
A canine lipoma usually feels:
Soft or “squishy”
Round or oval
Easily movable under the skin
Painless to touch
Slow growing
These lumps are most often located just beneath the skin and may gradually increase in size over time.
In most cases, lipomas grow slowly and do not cause discomfort. However, large tumors can sometimes interfere with mobility depending on their location.
Types of Lipomas in Dogs
Not all lipomas are exactly the same. Veterinarians recognize several types of fatty tumors in dogs.
1. Simple Lipoma
This is the most common type. It is:
Benign
Slow growing
Encapsulated
Located under the skin
These tumors typically do not spread or invade surrounding tissues.
2. Infiltrative Lipoma
This type is less common but can grow into surrounding tissues like muscles and nerves. While still considered benign, infiltrative lipomas can be more difficult to remove surgically.
3. Liposarcoma
This is the malignant (cancerous) form of fatty tumor. Fortunately, liposarcomas are rare in dogs but require aggressive treatment.
Because lipomas can sometimes resemble other tumors, proper veterinary diagnosis is essential.
When Should You Be Concerned About a Lump?
Although lipomas are usually harmless, any new lump should be examined by a veterinarian. Some cancerous tumors can feel similar to benign fatty tumors.
Pet owners should seek veterinary evaluation if a lump:
Appears suddenly
Grows quickly
Changes shape or firmness
Causes pain
Bleeds or leaks fluid
Interferes with walking or breathing
Veterinary examination ensures that more serious conditions are not overlooked.
How Veterinarians Diagnose Lipomas
At Bushnell Animal Clinic, diagnosing a lipoma usually begins with a thorough physical examination.
However, veterinarians often perform additional tests to confirm the diagnosis.
1. Physical Examination
Your veterinarian will evaluate:
Size of the lump
Location
Mobility under the skin
Consistency
These characteristics can suggest a lipoma, but further testing is usually recommended.
2. Fine Needle Aspirate (FNA)
This is the most common diagnostic test for lipomas.
A veterinarian inserts a small needle into the mass to collect cells, which are then examined under a microscope.
This test is quick, minimally invasive, and usually does not require sedation.
3. Biopsy
If results are unclear, a biopsy may be recommended. This involves removing a small piece—or the entire lump—for laboratory analysis.
4. Imaging
For large or deep tumors, diagnostic imaging such as:
X-rays
Ultrasound
CT scans
may be used to determine how far the mass extends.
Do Lipomas Need Treatment?
The good news is that most lipomas do not require treatment.
Because they are benign and slow growing, many dogs live comfortably with lipomas for years.
However, treatment may be recommended if a lipoma:
Becomes very large
Restricts movement
Causes discomfort
Grows rapidly
Is located in a sensitive area
In these cases, surgical removal is typically recommended.
Lipoma Surgery in Dogs
Surgery is the most effective treatment for problematic lipomas.
Surgical Removal
During the procedure:
The dog is placed under anesthesia.
The veterinarian makes an incision over the mass.
The lipoma is carefully removed.
The incision is closed with sutures.
For simple lipomas, surgical removal is usually curative, and recurrence is uncommon.
However, dogs may develop additional lipomas elsewhere on their body later in life.
Recovery After Surgery
Most dogs recover quickly from lipoma surgery.
Typical recovery includes:
Rest for 10–14 days
Wearing an e-collar
Monitoring the incision site
Your veterinarian will provide specific aftercare instructions.
Can Lipomas Be Prevented?
There is no guaranteed way to prevent lipomas, but certain lifestyle factors may help reduce the risk.
Maintain a Healthy Weight
Obesity is strongly associated with lipoma development. Maintaining a healthy body weight can reduce risk.
Balanced Diet
A high-quality diet appropriate for your dog’s age and activity level helps maintain overall health.
Regular Veterinary Exams
Routine checkups allow veterinarians to monitor any lumps and detect changes early.
Monitor Lumps at Home
Pet owners should regularly feel their dog’s body during grooming or petting. Early detection allows for faster diagnosis and treatment if needed.
Living With a Dog That Has Lipomas
Many dogs develop lipomas as they age and live perfectly normal lives.
If your dog has a diagnosed lipoma, your veterinarian may recommend simply monitoring it for changes.
Helpful monitoring tips include:
Measuring the lump periodically
Taking photos to track size
Noting changes in texture or firmness
Watching for discomfort
If anything changes, schedule a veterinary exam.
Lipomas vs. Other Lumps in Dogs
Not every lump is a lipoma. Dogs can develop many types of growths, including:
Sebaceous cysts
Mast cell tumors
Abscesses
Warts
Cancerous tumors
Because many lumps feel similar, professional evaluation is always recommended.
Veterinarians often emphasize a simple rule:
Every new lump should be checked.
When to See a Veterinarian
You should schedule a veterinary appointment if your dog develops a new lump or if an existing lump changes.
Seek veterinary care if you notice:
Rapid growth
Redness or swelling
Pain when touched
Changes in firmness
Difficulty walking
Loss of appetite or energy
Early evaluation ensures the best outcome for your dog.
Canine Lipoma Care at Bushnell Animal Clinic
At Bushnell Animal Clinic, Dr. Roger Hart and the veterinary team help pet owners evaluate and manage lumps and tumors in dogs every day.
Services include:
Comprehensive physical exams
Lump and mass evaluation
Fine needle aspirate testing
Surgical removal of masses
Ongoing monitoring of benign tumors
Our goal is to provide accurate diagnosis, compassionate care, and peace of mind for pet owners throughout the Bushnell community.
Final Thoughts
Finding a lump on your dog can be stressful, but in many cases, the cause is a benign lipoma. These fatty tumors are one of the most common growths seen in dogs and are usually harmless.
Still, every lump should be evaluated by a veterinarian to rule out more serious conditions.
If you notice a new lump on your dog—or if an existing lump changes in size or appearance—schedule an exam with Dr. Roger Hart at Bushnell Animal Clinic. Early evaluation helps ensure your dog stays healthy and comfortable for years to come.
Frequently Asked Questions About Lipomas in Dogs
What is a lipoma in dogs?
A lipoma is a benign tumor made of fat cells that develops under the skin. Lipomas are one of the most common lumps found in dogs, especially in middle-aged and older pets.
What does a lipoma feel like on a dog?
Lipomas usually feel soft, smooth, and movable under the skin. They are often described as rubbery lumps that can shift slightly when touched.
Are lipomas cancerous in dogs?
Most lipomas are benign and not cancerous. However, it is important for a veterinarian to evaluate any new lump to confirm the diagnosis.
Which dogs are more likely to develop lipomas?
Lipomas are more common in middle-aged or older dogs and in overweight dogs. Certain breeds may also be more prone to developing fatty tumors.
Do lipomas grow over time?
Yes. Lipomas often grow slowly over time. Some remain small while others can become larger depending on the dog and the location of the tumor.
Do lipomas need to be removed?
Many lipomas do not require removal if they are small and not causing problems. Surgical removal may be recommended if the lipoma grows large, interferes with movement, or causes discomfort.
Can lipomas become painful?
Most lipomas are painless. However, large lipomas or those located near joints or muscles may cause discomfort or restrict movement.
How are lipomas diagnosed in dogs?
Veterinarians usually diagnose lipomas by performing a fine needle aspirate, where a small sample of cells is collected and examined under a microscope.
Can lipomas come back after surgery?
If a lipoma is completely removed, it usually does not return in the same location. However, some dogs may develop new lipomas in other areas.
When should I take my dog to the veterinarian for a lump?
Any new lump or swelling on your dog should be examined by a veterinarian to determine whether it is a benign lipoma or another type of mass.
Related Dog Health Articles
You may also want to read these related veterinary topics:
• Dog Lump Under Skin
• Dog Abscess
• Sebaceous Cyst in Dogs
• Canine Papilloma Virus
• Hamartoma in Dogs
• Dog Mammary Tumor
• Dog Skin Infection
• Dog Warts and Skin Growths
• When to Worry About a Lump on Your Dog
• Dog Skin Tumors
