Finding a new lump or growth on your old dog can be worrying, especially if it seems to appear suddenly or change over time.
Many growths in senior dogs are harmless, but others can be a sign of more serious underlying conditions that need attention.
Old Dog Growths: Why It Happens
Old dog growths happen because cells grow or accumulate abnormally under or on the skin, sometimes forming harmless masses like fatty tumors, but in other cases developing into more serious conditions like cancer.
As dogs age, their cells don’t divide and repair as efficiently, increasing the likelihood of lumps, bumps, and abnormal tissue growth.
Growths in an old dog are most commonly caused by benign tumors, cysts, skin changes, or age-related cell abnormalities.
Old Dog Growths: Symptoms
If your old dog has growths, you may notice:
Lumps or bumps under or on the skin
Growths that are soft, firm, or irregular
Changes in size over time
Multiple growths appearing in different areas
Redness, swelling, or irritation
Ulceration or bleeding in some cases
Hair loss around the growth
Sensitivity or discomfort when touched
Read more: Old Dog Skin Problems (Symptoms, causes, treatment)
Old Dog Growths: Common Causes
Lipomas (Fatty Tumors)
Lipomas are the most common type of growth in older dogs. These are benign tumors made up of fat cells that accumulate under the skin, usually feeling soft, movable, and painless. They often develop slowly and can appear on the chest, abdomen, or limbs.
In older dogs, changes in metabolism and fat distribution make lipomas more likely. Some dogs develop just one, while others may develop multiple over time.
Although they are typically harmless, very large lipomas can interfere with movement or comfort, especially if located near joints.
Read more: Old Dog Lumps and Bumps (Causes and treatment)
Sebaceous Cysts
Sebaceous cysts form when oil-producing glands in the skin become blocked. This blockage causes a buildup of material beneath the skin, creating a lump that may feel firm or slightly soft.
These cysts can remain stable or slowly increase in size.
Sometimes, the cyst may rupture, releasing a thick substance and causing irritation or inflammation. Older dogs are more prone to these due to changes in skin health and slower cell turnover.
While usually not dangerous, they can become infected if irritated.
Warts (Papillomas)
Warts are small, raised growths caused by viral or age-related skin changes. In older dogs, they may appear due to a weakened immune system or natural skin aging rather than infection.
These growths often have a rough, cauliflower-like appearance and can develop around the mouth, eyes, or body.
They are generally benign but can become irritated if located in areas of friction. Most do not require treatment unless they cause discomfort.
Mast Cell Tumors
Mast cell tumors are a common type of skin cancer in dogs. They can vary greatly in appearance, sometimes looking like harmless lumps, which makes them easy to overlook. They may change size, become inflamed, or appear suddenly.
These tumors release substances that can cause swelling, redness, or irritation around the area.
In older dogs, the risk of mast cell tumors increases, making any new or changing lump important to evaluate. Early detection is critical for effective treatment.
Infections
Not all growths are tumors—some are caused by infection. An abscess forms when bacteria enter the body through a wound, leading to a pocket of pus that creates a swollen, often painful lump.
These growths may appear suddenly and feel warm or tender. The skin over the area may be red, and your dog may lick or avoid the area.
Older dogs may take longer to heal from infections, making these growths more noticeable.
Tumors (Benign or Malignant)
In addition to lipomas, other tumors can develop in older dogs. Benign tumors grow slowly and typically do not spread, while malignant tumors can grow rapidly and invade surrounding tissues.
Cancerous growths may feel firm, irregular, or attached to deeper tissues. They may also grow quickly or change shape over time.
Because the risk of cancer increases with age, it’s important not to assume a lump is harmless without proper evaluation.
Skin Tags
Skin tags are small, soft growths that commonly appear as dogs age. These are usually harmless and develop due to changes in skin elasticity and cell growth.
They may appear as small flaps or raised areas on the skin and are often found in areas of friction, such as under the legs or around the neck.
While not dangerous, they should still be monitored for changes.
Old Dog Growths: What to Do
Start by gently examining any growth you notice, paying attention to its size, texture, and location.
Keeping a record or taking photos can help you track changes over time.
Avoid squeezing or poking the growth, as this can cause irritation or infection.
Check your dog regularly for new growths or changes in existing ones, especially as they age.
Maintain a healthy weight and overall care routine, as general health can influence skin and tissue condition.
Even if the growth seems harmless, schedule a veterinary check to confirm the diagnosis.
When to Call or Visit Your Vet
Any new growth on your old dog should be evaluated by your veterinarian. It’s not possible to determine the type of growth based on appearance alone.
Seek prompt attention if the growth grows quickly, changes shape, or becomes firm or irregular.
These can be warning signs of a more serious condition.
You should also contact your vet if the growth becomes painful, bleeds, or shows signs of infection.
If your dog shows changes in behavior, appetite, or energy alongside the growth, this may indicate a deeper issue.
Old Dog Growths: Treatment
Treatment for old dog growths depends on the diagnosis. Your vet may perform a fine needle aspiration or biopsy to determine the nature of the growth.
Benign growths like lipomas may simply be monitored unless they cause discomfort or interfere with movement.
Infected growths or abscesses may require drainage and medication to resolve.
Cancerous tumors may require surgery, medication, or additional treatments depending on type and severity.
Key Takeaway
Old dog growths are common, but they should always be taken seriously.
While many are harmless, some can indicate more serious health concerns that require attention.
By monitoring changes and seeking veterinary care when needed, you can ensure your dog stays comfortable, healthy, and well cared for in their senior years.