Scariest Types of Skin Tumors in Dogs

Written by Amber LaRock
Updated: April 25, 2023
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As humans, we should check our skin regularly for any new lumps or moles. This stands true for our canine companions as well. Pups can develop skin tumors and growths just like me and you, which is why we should lookout for changes.

If you find a lump on your dog’s skin, you may wonder what it means or what you should do. We want you to be as informed as possible when it comes to canine skin tumors. In this article, we discuss everything you need to know! We discuss the scariest types of skin tumors in dogs, what these tumors look like, and how to treat them. Let’s dive in!

What Is a Skin Tumor in Dogs?

Boston Terrier - Boston Terrier Teeth

A skin tumor in dogs is an abnormal collection of tissue on or near the surface of the dog’s skin.

©Roschetzky Photography/Shutterstock.com

Before we dive into dangerous skin tumors in dogs, we should first cover what a skin tumor is. A canine skin tumor is an abnormal collection of tissue on or near the surface of the dog’s skin. These tumors can be either benign or cancerous. There is often no way to know until the tumor is tested by your veterinarian. While some growths will not impact your dog’s overall health, it’s always best to have all tumors assessed.

Are All Skin Tumors in Dogs Bad?

Just as we mentioned above, not all skin tumors in dogs will be cancerous. There are many types of skin growths in dogs that are not a threat to their health. And many growths can be treated effectively with medical care. You don’t have to assume the worst when your furry friend develops a lump on her body.

A few examples of benign growths that are often seen in dogs include skin tags, hives, abscesses, cysts, lipomas, granulomas, and perianal adenomas. Your vet will need to accurately identify these benign growths before ruling out a dangerous tumor. But there’s a high chance that your dog’s growth is nothing to worry about.

What Are the Symptoms of a Skin Tumor in Dogs?

You will need to know what symptoms to be on the lookout for! This way, you can schedule an appointment with your vet from the moment you notice any of the following symptoms:

  • A raised growth or lump on the surface of the dog’s skin
  • A lump on the skin that does not go away within a few days of noticing it
  • A lump on the skin that grows rapidly
  • A painful growth or lump on the dog’s skin
  • Limping on the leg where a growth is present
  • Unexplained discoloration of the skin

If you notice any of these symptoms, then we suggest reaching out to your vet for guidance. Dogs can develop the benign growths we mentioned above, but it’s always best to be safe!

Scariest Types of Skin Tumors in Dogs

Dogs can develop a variety of growths on their skin, some benign and some cancerous in nature.

©iStock.com/Chellym

Now that you have a better understanding of skin tumor in dogs, it’s time to dive into the scariest types of skin tumors that can develop in our furry friends. Each of the tumors below can have a significant impact on a dog’s health, so let’s break down everything you need to know!

Mast Cell Tumor

Mast cell tumors in dogs are the most common form of canine skin cancer. Not only do they win the title of the most common type of skin cancer in dogs, but they are also unfortunately one of the most dangerous forms of skin cancer as well. Not only are they an invasive cancer that is known to metastasize, but they also pose a unique risk that other tumors do not possess.

Mast cell tumors in dogs are made up of mast cells, and these are cells that play a major role in the dog’s immune response. Because of this, the tumors can pose a great danger if they are irritated or manipulated in any way. Irritation of the tumor can cause the body to release a dangerous amount of histamine, ultimately leading to an anaphylactic reaction for the dog affected.

Mast cell tumors can range in appearance, which is why we always suggest having all tumors examined by your vet. Some mast cell tumors are small and appear unthreatening, but this is far from the truth.

Soft Tissue Sarcoma

Soft tissue sarcomas in dogs are a form of skin cancer that involves the dog’s connective and nervous tissues. While this tumor technically develops below the surface of the skin, it often leads to a noticeable lump that can be easily palpated when examining the area. They are often more noticeable as well due to commonly developing on the legs, as well as on the chest.

Soft tissue sarcomas in dogs are known for being highly invasive, as they have long roots that attach them to the surrounding connective tissue. They are also known for being very painful, and often lead to limping if the tumor develops on the leg.

Squamous Cell Carcinoma

Squamous cell carcinomas in dogs are a type of cancer that develops from the dog’s skin cells. This means that it can develop anywhere on the dog’s body, as it can be found anywhere that skin cells are present. While this is a form of cancer, it is only known to be locally invasive, and it typically grows slowly. This does not mean the cancer should be ignored, but it is often much easier to treat when it is found early for these reasons.

Melanoma

Many pet parents are aware of the type of skin cancer known as melanoma, as it is a cancer that most humans are on the lookout for on their own skin. Unfortunately for our pups, dogs can develop melanoma on their skin as well. Melanoma is a malignant form of skin cancer in dogs, and it is known to spread quickly when it is present.

Though it is most often seen on the mucous membranes within the dog’s mouth, they can be found on the skin as well. There is a misconception that all melanomas tumors are dark in color, but their appearance can vary greatly in dogs.

Mammary Tumor

Mammary tumors in dogs originate from the dog’s mammary glands. But they can be mistaken for a lump on the skin once the tumor beings to grow. Many mammary tumors will erupt out of the skin as they progress. And some will even ulcerate and begin to bleed. These masses may be present on the skin. However, as they progress, you will typically feel a large lump that travels deep into the dog’s mammary tissue.

How To Treat a Skin Tumor in Dogs

If your dog has been diagnosed with a skin tumor, you are likely searching for answers. Every type of cancer will have its own approved treatment methods. But the most common treatment options on the table are surgical removal, radiation therapy, or chemotherapy when there is metastasis. Treatment will vary based on progression of the tumor. It will also depend on how many body systems are involved if the cancer has spread.

Due to how unique each case can be, we suggest trusting your vet’s guidance when it comes to treatment. While the methods we listed above are the most common treatment options, your pup’s situation may require a different approach. Your vet is the only one that understands the details of your dog’s condition. We suggest leaning on your veterinary team for clarity.

Final Thoughts

As you can see, our beloved companions can develop a variety of tumors that can impact their overall health. While some of these lumps are benign and nothing to worry about, others will require diligent medical care. We suggest always having your dog’s tumor assessed by a vet for a proper diagnoses, and trusting their guidance each step of the way.

The photo featured at the top of this post is © Holly Michele/Shutterstock.com

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About the Author

Amber LaRock is a writer at A-Z Animals primarily covering topics surrounding pet health and behavior. Amber is a Licensed Veterinary Technician with 12 years of experience in the field, and she holds a degree in veterinary technology that she earned in 2015. A resident of Chiang Mai, Thailand, Amber enjoys volunteering with animal rescues, reading, and taking care of her two cats.

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