Dog Has Big Round Swollen Bump on Back​: What To Do

As a dog owner, noticing a big round swollen bump on your dog's back can be alarming. While some lumps and bumps are harmless, others can indicate more serious health concerns. Understanding what might be causing the bump and knowing when to seek veterinary care is essential for ensuring your dog's health and well-being.

What is a Swollen Bump on a Dog's Back?

A swollen bump on a dog’s back can vary in size, shape, and consistency. It may appear suddenly or develop over time. The bump might be soft or firm, movable or fixed, and it could cause the dog to show signs of discomfort or pain, or it could be entirely painless. Identifying the nature of the bump and its location is crucial for determining its cause and how to address it.

Some common characteristics of the bump include:

• Size: A round swollen bump may be large or small. Larger bumps might be more concerning, especially if they continue to grow.
• Shape: The bump may appear as a well-defined circle or oval.
• Texture: It could be soft, firm, or even hard.
• Movement: Some bumps are movable under the skin, while others may be fixed in place.
• Painfulness: Depending on the underlying cause, the bump may be painful or not painful at all.
  
  

Causes of a Big Round Swollen Bump on a Dog’s Back

There are several possible causes for a swollen bump on a dog’s back. These can range from benign conditions like lipomas to more serious concerns like tumors or abscesses. Understanding the possible causes can help you determine whether you need to seek veterinary care and what steps to take.

1. Lipoma (Benign Fatty Tumor)

A lipoma is a common benign (non-cancerous) fatty tumor that can develop in various areas of a dog’s body, including the back. These growths are generally soft, round, and movable under the skin. Lipomas are more commonly found in middle-aged or older dogs, particularly larger breeds such as Labrador Retrievers, Golden Retrievers, and Doberman Pinschers.

Symptoms:

• Round, soft, and movable bump
• Painless or mildly tender to the touch
• Slow-growing

Treatment: In most cases, lipomas do not require treatment unless they interfere with the dog’s movement, cause pain, or grow very large. If necessary, the vet may recommend surgical removal.

2. Abscess

An abscess is a collection of pus that forms as a result of an infection. It typically occurs when bacteria enter a wound or follicle and cause localized infection. Abscesses can appear as swollen, round, and sometimes painful bumps. They can develop on the back due to a scratch, bite, or other trauma to the skin.

Symptoms:

• Swelling, redness, and heat around the bump
• Pus drainage (if the abscess ruptures)
• Pain or tenderness when touched
• Fever or lethargy (if the infection is severe)
  
  

Treatment: Abscesses often require draining and antibiotic treatment. Your veterinarian may need to lance the abscess to release the pus and may prescribe antibiotics to combat the infection.

3. Sebaceous Cyst

A sebaceous cyst is a sac-like structure that can develop under the skin when a sebaceous gland (which produces oil) becomes blocked. These cysts are often filled with a thick, yellowish substance and may appear as round, movable bumps.

Symptoms:

• Round, firm bump on the skin
• Painless or mildly tender to the touch
• Possible foul odor if the cyst ruptures

Treatment: If the sebaceous cyst is causing discomfort or becomes infected, it may need to be drained or surgically removed. If the cyst is small and not causing any issues, it may be left alone.

4. Mast Cell Tumor (Cancerous Tumor)

A mast cell tumor is a type of cancer that can form under the skin. These tumors can vary in size and may appear as round, firm, and irregularly shaped lumps. While they can be benign, many mast cell tumors are malignant and can spread to other areas of the body.

Symptoms:

• Firm, raised, round bump
• May change in size or shape over time
• May be red or inflamed, particularly if the tumor is irritated
• Ulceration or open wounds on the surface of the bump
• Itching or pain around the bump

Treatment: Mast cell tumors may require surgical removal. Depending on the stage of cancer, additional treatment such as chemotherapy or radiation may be necessary. A biopsy is typically performed to determine whether the tumor is benign or malignant.

5. Hematoma

A hematoma is a localized collection of blood that forms when a blood vessel breaks. It can occur after trauma, such as a fall or rough play. Hematomas are often round and may be soft or firm to the touch. They can occur on any part of the body, including the back.

Symptoms:

• Swelling or bulging in a specific area
• Pain or tenderness
• Color changes (from red to purple as the blood clot heals)

Treatment: Small hematomas may resolve on their own, but larger ones may require drainage or surgical removal to prevent infection and promote healing.

6. Infections or Fungal Growths

Fungal infections, such as ringworm or dermatophytes, can cause round swollen areas on a dog’s back. These infections often result in red, inflamed skin, and the development of scaly, crusty lesions that can appear as lumps or bumps.

Symptoms:

• Red, swollen, and inflamed areas
• Hair loss or thinning in the affected area
• Crusty or scaly patches
• Itching or discomfort

Treatment: Fungal infections can be treated with topical antifungal medications or oral medications, depending on the severity of the infection.

7. Fatty Tumor or Fibroma

Both fibromas and fatty tumors are benign growths that can appear as lumps on a dog’s back. These growths are typically firm and can be located deep under the skin. Fibromas are made of fibrous tissue, while fatty tumors are made of fat cells.

Symptoms:

• Firm, round, and painless bump
• Slow-growing over time

Treatment: If the growth is causing discomfort or limiting mobility, it may need to be surgically removed. In many cases, fibromas and fatty tumors do not pose a health risk.

When to See a Veterinarian

If you notice a large, round, swollen bump on your dog's back, it’s essential to observe your dog for additional signs such as pain, changes in behavior, fever, or signs of infection. While many lumps and bumps are benign, some can be indicative of serious conditions that require prompt treatment.

It’s important to seek veterinary care if:

• The bump continues to grow or changes in appearance.
• Your dog shows signs of pain, fever, or lethargy.
• The bump is firm, hard, or irregularly shaped.
• The bump interferes with your dog’s movement or quality of life.
  
  

Diagnosis and Treatment

To determine the cause of the swollen bump, a veterinarian will typically perform a physical examination. They may recommend diagnostic tests such as:

• Fine Needle Aspiration (FNA): A needle is used to collect a sample of cells from the lump to determine whether it is benign or malignant.
• Biopsy: If a more detailed examination of the tissue is needed, a biopsy may be performed to identify the type of growth.
• X-rays or Ultrasound: In cases where an internal issue like an abscess or hematoma is suspected, imaging studies may be performed.
• Blood Work: To check for signs of infection, inflammation, or other underlying health conditions.

Once the diagnosis is made, treatment options will be tailored to the specific condition. This may involve surgery, medication, or monitoring the bump over time.

Prevention and Monitoring

While not all bumps on a dog’s back can be prevented, some general steps can help keep your dog healthy and reduce the risk of growths and tumors:

• Regular Veterinary Check-ups: Routine visits to the vet can help detect lumps and bumps early, making treatment more effective.
• Weight Management: Keeping your dog at a healthy weight can help reduce the risk of fatty tumors and other conditions.
• Protecting Your Dog from Trauma: Preventing injuries that can lead to abscesses, hematomas, or other growths can be beneficial.
• Monitoring Changes: Regularly check your dog’s body for any new lumps, bumps, or changes in existing growths.

Conclusion

A big round swollen bump on your dog’s back may seem concerning, but it could be caused by a variety of conditions, from benign lipomas to more serious issues like tumors or abscesses. Promptly seeking veterinary care and following the recommended treatment plan is essential to your dog’s health and well-being.

By staying vigilant and observing changes in your dog’s condition, you can help ensure early detection and effective treatment of any underlying issues. Regular veterinary check-ups, good care practices, and close attention to your dog’s health will give you peace of mind and keep your furry companion happy and healthy.