Vet-Approved Guide: Skin Cancer in Dogs (Signs, Types, and Vet Care)
You were brushing or petting your beloved dog when suddenly you came across a bump or lump on their skin. There is no reason for panicking! Those bumps or lumps can be simple bug bites or just a skin rash.
However, in some cases, lumps and bumps on a dog's skin can be skin cancer. Moreover, some skin cancers, such as melanoma, can present as dark-colored or black spots.
The good news is that most of the time, skin cancer in dogs is benign or non-cancerous (60-80% of cases). So, if you notice a scab or crust, black spot, a red bump, or lump on your dog's skin, there's a good chance it won't be a cause for concern. However, only the appearance of a skin growth is not enough to predict whether your dog has skin cancer or not, so it is advisable to take your pet to the vet as soon as possible.
In this article, we will cover all the important things you need to know about dogs' malignant skin cancer.
What Is Dog Skin Cancer?
Skin cancer is caused by an abnormal growth of healthy skin cells and can occur due to the action of several factors, such as some viruses, sun exposure, hormonal imbalances, or chemicals in the environment.
It is a fairly common condition in dogs and can result in both malignant (cancerous) and benign (non-cancerous) tumors. Early detection of skin cancer in dogs is important for timely veterinary care and a clearer outlook.
What Are the Causes of Skin Cancer In Dogs?
Skin cancer in dogs can be linked to sun exposure (especially in light-skinned or sparsely haired areas), genetics and breed predisposition (for example mast cell tumors in some breeds), non-healing wounds or scars, and chronic skin irritation from allergies or compulsive licking/scratching.
UV-linked squamous cell carcinoma is more common in short-coated and light-skinned dogs. Any suspicious growth still needs a veterinary exam rather than a wait-and-see approach based on breed alone.
What Does Dog Skin Cancer Look Like: Clinical Signs
Skin cancer can range from small red or black spots on the skin to large cauliflower-like growths with or without a foul odor. Here's what to look for when you suspect your dog has skin cancer:
- Lumps or bumps of various sizes
- Nodules
- Red areas
- Black spots or growths
- Red spots or growths
- Crusts or scabs
- Sores
- Hyperpigmentation
- Skin ulcers
- Unpleasant skin odor
- Wounds that won't heal at all or have delayed healing
- Lesions that have hardened, irregular edges
- Abnormal discharge
If there is a malignant skin cancer that has spread to other organs, here are other clinical signs you may notice (in addition to those mentioned above):
- Coughing
- Difficulty breathing
- Weight loss
- Low appetite
- Lethargy
- Low energy (your dog refuses to play and sleeps almost all day long)
- Changed behavior
The time you spend with your beloved friend petting, brushing, or bathing should give you the perfect opportunity to check their skin for external parasites, tumors, or any other abnormalities that should not be on your dog's skin. The sooner the vet diagnoses skin cancer, the better it will be for your pet!
Types of Skin Cancer in Dogs
Common skin cancers and related growths in dogs include:
- Squamous cell carcinoma (SCC) - often linked to sun exposure; may appear as scabby, crusted, or ulcerated lesions.
- Mast cell tumors - common skin tumors that can look like simple bumps; grading matters for outlook and care planning.
- Melanoma - may appear as dark or pigmented spots or masses; behavior depends on location and pathology.
- Soft tissue sarcomas - firm masses in skin or under the skin that may grow slowly at first.
- Other growths - including sebaceous tumors, histiocytomas (often in younger dogs), and lipomas (usually benign fatty lumps).
Only a veterinarian can tell these apart with exam findings and, when needed, cytology or biopsy. Do not assume a lump is "just a fatty tumor" without professional evaluation.
Diagnostic Approaches to Skin Cancer in Dogs: An Overview
Diagnosis usually starts with a physical exam and a detailed history of when the lesion appeared and how it has changed. Common next steps include fine-needle aspiration (FNA), biopsy, and cytology or histopathology. Your veterinarian may also recommend imaging or lab work to check for spread before outlining a care plan.
Staging and Grading of Skin Cancer
After a diagnosis, veterinarians may stage and grade skin cancer to understand how far it has spread and how aggressive the cells appear. Staging can involve lymph node checks, imaging, and bloodwork. Grading comes from pathology. Together, these results help your vet discuss realistic care options and monitoring plans.
Supportive Care at Home for Dogs With Skin Cancer
Home supportive care should follow your veterinarian's guidance. Helpful habits often include protecting sun-sensitive skin when advised, preventing licking or trauma to lesions, monitoring growths for changes in size/color/odor, and keeping follow-up appointments for staging and biopsy results.
Do not try to remove or treat a suspected cancerous growth at home. Veterinary diagnosis comes first.
How Long Can a Dog Live with Skin Cancer?
Life expectancy depends on the cancer type, grade, stage, and how early veterinary care begins. Some skin tumors are local and manageable with surgery; others are more aggressive or already spread when found. Your veterinarian or oncology team can give the most meaningful outlook based on your dog's pathology and staging results.
Coping Emotionally When Your Dog Has Skin Cancer
A skin cancer diagnosis can be emotional for pet parents. Lean on your veterinary team for clear next steps, and give yourself permission to ask questions about quality of life, monitoring, and supportive care at home.
Natural immune support alongside veterinary care
Surgery, radiation, chemotherapy, immunotherapy, and related veterinary options are the foundation of skin cancer care for many dogs. Alongside that plan, many pet parents also ask about everyday wellness support.
If you are looking for a natural product for daily wellness support, you can learn more about PiptoPet.
PiptoPet is a birch-polypore formula (Fomitopsis betulina) designed to support a healthy immune response in dogs and cats. It is meant to complement your veterinarian's care plan, not replace diagnosis, surgery, radiation, chemotherapy, immunotherapy, or other veterinary care for skin cancer. Talk with your veterinarian before adding anything new to your dog's routine.
PiptoPet has also been discussed in third-party reviews by pet parents in Dogster, Catster, and Hepper.
For everyday supportive habits during cancer care, see also our guide to supporting dogs through cancer care. A companion post on supportive home habits for dogs with skin concerns is also available separately; this guide stays focused on signs, types, diagnosis, and veterinary care education.
Frequently Asked Questions (FAQs)
What does skin cancer look like on a dog?
Skin cancer on a dog can look like many things (sores, bumps, lumps, lesions that do not heal, and so on). However, they often show up as firm lumps either on or under the skin. In some cases, several small lumps may develop in the same area. If you notice one or more lumps on your dog's skin, don't panic. Take your pet to the vet for a definitive diagnosis.
What are the most common types of skin cancer in dogs?
The most common types of skin cancer in dogs are mast cell tumors (MCT) and squamous cell carcinoma (SCC). Some breeds are more prone to MCT, such as Boxers, Weimaraners, Golden Retrievers, and Boston Terriers. SCC usually affects older dogs, and those exposed to sunlight may be at increased risk.
Can skin cancer in dogs respond to veterinary care?
Many types of skin cancers in dogs can respond to veterinary care, especially when diagnosed early. Care plans often include one or a combination of surgery, chemotherapy, and radiation therapy (and in some cases, immunotherapy). In some cases, surgery alone can lead to remission, where no sign of cancer is detected for long periods.
What causes skin cancer in dogs?
The exact cause of skin cancer in dogs is unknown. However, certain factors can increase a dog's risk, such as genetics, sun exposure, environmental factors (pesticides, secondhand smoke), breed, skin trauma, and chronic irritation.
For any new lump, bump, or skin change, schedule a veterinary exam rather than waiting to see if it resolves on its own.
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2 comments
Hi Anji,
Thank you for your comment! I’m very sorry to hear about your dog’s case. I will reach out by email to answer your questions about the excellent benefits of the Piptopet!
Trying to find an answer to my labrador’s squamous cell on his leg. Reading your website and came across a confusing sentence your marketing manager would want to rectify.
anti-inflammatory and anti-tumor properties, it help the body in his fight to targets unhealthy cells while leaving
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