Skin cancer is one of the more common forms of cancer seen in dogs, yet many pet owners are unaware that dogs can develop dangerous skin tumours. While not every lump or bump is cancerous, some skin growths can become aggressive and life-threatening if left untreated. The good news is that early detection and prompt veterinary treatment can make a significant difference in your dog’s outcome and quality of life. As loving pet owners, understanding the warning signs, causes, risk factors and treatment options for skin cancer can help protect your dog and ensure they receive veterinary attention as early as possible. What Is Skin Cancer in Dogs? Skin cancer occurs when abnormal cells grow uncontrollably in or under the skin. Dogs can develop many different types of skin tumours, ranging from harmless fatty lumps to aggressive malignant cancers that may spread to other parts of the body. Unlike humans, where many skin cancers are directly linked to sun exposure, most canine skin cancers are not caused by sunlight. However, ultraviolet (UV) radiation can still play a role in certain types of skin cancers, especially in dogs with light-coloured skin or thin coats. Skin cancer can appear anywhere on a dog’s body and may affect dogs of any age or breed, although older dogs are generally at greater risk. Common Signs of Skin Cancer in Dogs One of the challenges with skin cancer is that it can look very different from one dog to another. Some tumours grow rapidly, while others develop slowly over months or years. Pet owners should watch for: New lumps or bumps on the skin Growths that change size, shape or colour Sores that do not heal Red or inflamed skin lesions Bleeding or ulcerated masses Itchy or irritated areas Hair loss around a lump Swelling beneath the skin Growths in the mouth or around the nails Persistent licking or scratching at one area Not every lump is cancerous, but every new lump should be checked by a veterinarian. Early diagnosis is one of the most important factors in successful treatment. The Most Common Types of Skin Cancer in Dogs Mast Cell Tumours (MCTs) Mast cell tumours are the most common malignant skin tumours seen in dogs. Mast cells are part of the immune system and normally help with allergic reactions and inflammation. When these cells become cancerous, they form tumours within the skin or beneath it. Mast cell tumours are often called “the great pretenders” because they can look like almost anything. Some appear as small harmless lumps, while others become red, swollen, ulcerated or rapidly changing masses. These tumours may: Change size suddenly Become itchy or inflamed Cause redness or swelling Release histamine, leading to irritation or digestive upset Certain breeds are more prone to mast cell tumours, including: Boxers Bulldogs Boston Terriers Pugs Labrador Retrievers Golden Retrievers Diagnosis usually involves a fine needle aspirate, where a small sample of cells is collected and examined under a microscope. Treatment typically involves surgical removal. Many mast cell tumours can be cured if detected early and removed completely. However, some aggressive forms may require: Chemotherapy Radiation therapy Ongoing monitoring Veterinarians often recommend sending the tumour to a laboratory after surgery to determine how aggressive it is and whether additional treatment may be necessary. Melanoma in Dogs Melanomas arise from melanocytes, the pigment-producing cells in the body. These tumours are commonly dark or black in colour, although some may appear pink or non-pigmented. Melanomas can occur: On the skin In the mouth Around the nail beds On the lips Skin melanomas are often benign in dogs and can usually be cured with surgery. However, oral melanomas and nail-bed melanomas are often much more aggressive and can spread quickly to the lungs and lymph nodes. Signs of oral melanoma may include: Bad breath Bleeding from the mouth Difficulty eating Drooling Swelling around the mouth Treatment may include: Surgery Radiation therapy Immunotherapy Melanoma vaccines such as Oncept® Early diagnosis is critical because aggressive melanomas can spread rapidly. Squamous Cell Carcinoma Squamous cell carcinoma (SCC) is one of the skin cancers most commonly linked to sun exposure in pets. This cancer develops from skin cells and often affects areas with sparse hair or light pigmentation. Common locations include: Nose Eyelids Ears Abdomen Groin area Dogs with white or thin coats are particularly vulnerable. Squamous cell carcinoma may appear as: Crusty sores Non-healing wounds Raised red lesions Ulcerated skin If caught early, surgery can often be curative. More advanced cases may require radiation therapy or additional treatments. Hemangiosarcoma of the Skin Cutaneous hemangiosarcoma is another sun-related cancer that can affect dogs, especially those with thin fur or pale skin on their stomach and inner thighs. This cancer develops from blood vessel cells and may initially appear as: Red or black skin growths Bruise-like lesions Small blood-filled masses Dogs that frequently sunbathe on their backs may be at increased risk. The danger with hemangiosarcoma is that it can eventually spread internally and become extremely aggressive if not treated early. Fortunately, if detected early and surgically removed, many dogs do very well. Which Dogs Are Most at Risk? While any dog can develop skin cancer, some factors increase the risk: Breed Predisposition Certain breeds are genetically more prone to specific skin cancers. Age Older dogs are more likely to develop tumours. Sun Exposure Dogs that spend long periods outdoors in intense sunlight are at greater risk for sun-related cancers. Coat and Skin Colour Dogs with: White fur Pink skin Thin coats Sparse hair are more vulnerable to UV damage. How Is Skin Cancer Diagnosed? Veterinarians use several methods to diagnose skin cancer, including: Physical Examination Your veterinarian will assess the size, appearance and location of the growth. Fine Needle Aspirate A small needle is used to collect cells for microscopic examination. Biopsy A tissue sample may be surgically removed and sent to a veterinary pathologist. Imaging X-rays, ultrasounds or CT scans may be needed to determine if the cancer has spread. Treatment Options for Skin Cancer in Dogs Treatment depends on: The type of cancer The location Whether it has spread Your dog’s overall health Common treatments include: Surgery Surgical removal is often the first and most effective treatment for many skin cancers. Radiation Therapy Used when complete surgical removal is not possible or when tumours are aggressive. Chemotherapy May be recommended for cancers with a high risk of spreading. Immunotherapy Some cancers, such as melanoma, may respond to specialised immune-based treatments. Targeted Therapies Modern veterinary oncology offers newer medications designed to target specific cancer cells. Can Skin Cancer Be Prevented? While not all skin cancers can be prevented, there are steps pet owners can take to reduce risk: Limit excessive sun exposure, especially during peak UV hours Keep light-skinned dogs indoors during the hottest part of the day Use pet-safe sunscreen on vulnerable areas Avoid shaving double-coated dogs too short Perform regular skin checks at home Schedule annual veterinary wellness exams Never use human sunscreen products unless approved by your veterinarian, as some ingredients may be toxic if licked. The Importance of Early Detection One of the most important things pet owners can do is regularly examine their dog’s skin. Many skin cancers are highly treatable when caught early. A good rule is: “If you find a lump, have it checked.” Do not assume a growth is harmless simply because your dog seems comfortable. Some aggressive cancers can appear small and innocent in the early stages. Final Thoughts Hearing the word “cancer” is frightening for any pet owner, but advances in veterinary medicine have dramatically improved outcomes for dogs with skin cancer. Many skin tumours can be successfully treated when detected early, allowing dogs to continue living happy and comfortable lives. Regular home checks, annual veterinary examinations and prompt attention to unusual lumps or skin changes are the best ways to protect your dog. If you notice anything unusual on your dog’s skin, do not wait. Early veterinary intervention could save your pet’s life.
Skin cancer is one of the more common forms of cancer seen in dogs, yet many pet owners are unaware that dogs can develop dangerous skin tumours. While not every lump or bump is cancerous, some skin growths can become aggressive and life-threatening if left untreated. The good news is that early detection and prompt veterinary treatment can make a significant difference in your dog’s outcome and quality of life. As loving pet owners, understanding the warning signs, causes, risk factors and treatment options for skin cancer can help protect your dog and ensure they receive veterinary attention as early as possible. What Is Skin Cancer in Dogs? Skin cancer occurs when abnormal cells grow uncontrollably in or under the skin. Dogs can develop many different types of skin tumours, ranging from harmless fatty lumps to aggressive malignant cancers that may spread to other parts of the body. Unlike humans, where many skin cancers are directly linked to sun exposure, most canine skin cancers are not caused by sunlight. However, ultraviolet (UV) radiation can still play a role in certain types of skin cancers, especially in dogs with light-coloured skin or thin coats. Skin cancer can appear anywhere on a dog’s body and may affect dogs of any age or breed, although older dogs are generally at greater risk. Common Signs of Skin Cancer in Dogs One of the challenges with skin cancer is that it can look very different from one dog to another. Some tumours grow rapidly, while others develop slowly over months or years. Pet owners should watch for: New lumps or bumps on the skin Growths that change size, shape or colour Sores that do not heal Red or inflamed skin lesions Bleeding or ulcerated masses Itchy or irritated areas Hair loss around a lump Swelling beneath the skin Growths in the mouth or around the nails Persistent licking or scratching at one area Not every lump is cancerous, but every new lump should be checked by a veterinarian. Early diagnosis is one of the most important factors in successful treatment. The Most Common Types of Skin Cancer in Dogs Mast Cell Tumours (MCTs) Mast cell tumours are the most common malignant skin tumours seen in dogs. Mast cells are part of the immune system and normally help with allergic reactions and inflammation. When these cells become cancerous, they form tumours within the skin or beneath it. Mast cell tumours are often called “the great pretenders” because they can look like almost anything. Some appear as small harmless lumps, while others become red, swollen, ulcerated or rapidly changing masses. These tumours may: Change size suddenly Become itchy or inflamed Cause redness or swelling Release histamine, leading to irritation or digestive upset Certain breeds are more prone to mast cell tumours, including: Boxers Bulldogs Boston Terriers Pugs Labrador Retrievers Golden Retrievers Diagnosis usually involves a fine needle aspirate, where a small sample of cells is collected and examined under a microscope. Treatment typically involves surgical removal. Many mast cell tumours can be cured if detected early and removed completely. However, some aggressive forms may require: Chemotherapy Radiation therapy Ongoing monitoring Veterinarians often recommend sending the tumour to a laboratory after surgery to determine how aggressive it is and whether additional treatment may be necessary. Melanoma in Dogs Melanomas arise from melanocytes, the pigment-producing cells in the body. These tumours are commonly dark or black in colour, although some may appear pink or non-pigmented. Melanomas can occur: On the skin In the mouth Around the nail beds On the lips Skin melanomas are often benign in dogs and can usually be cured with surgery. However, oral melanomas and nail-bed melanomas are often much more aggressive and can spread quickly to the lungs and lymph nodes. Signs of oral melanoma may include: Bad breath Bleeding from the mouth Difficulty eating Drooling Swelling around the mouth Treatment may include: Surgery Radiation therapy Immunotherapy Melanoma vaccines such as Oncept® Early diagnosis is critical because aggressive melanomas can spread rapidly. Squamous Cell Carcinoma Squamous cell carcinoma (SCC) is one of the skin cancers most commonly linked to sun exposure in pets. This cancer develops from skin cells and often affects areas with sparse hair or light pigmentation. Common locations include: Nose Eyelids Ears Abdomen Groin area Dogs with white or thin coats are particularly vulnerable. Squamous cell carcinoma may appear as: Crusty sores Non-healing wounds Raised red lesions Ulcerated skin If caught early, surgery can often be curative. More advanced cases may require radiation therapy or additional treatments. Hemangiosarcoma of the Skin Cutaneous hemangiosarcoma is another sun-related cancer that can affect dogs, especially those with thin fur or pale skin on their stomach and inner thighs. This cancer develops from blood vessel cells and may initially appear as: Red or black skin growths Bruise-like lesions Small blood-filled masses Dogs that frequently sunbathe on their backs may be at increased risk. The danger with hemangiosarcoma is that it can eventually spread internally and become extremely aggressive if not treated early. Fortunately, if detected early and surgically removed, many dogs do very well. Which Dogs Are Most at Risk? While any dog can develop skin cancer, some factors increase the risk: Breed Predisposition Certain breeds are genetically more prone to specific skin cancers. Age Older dogs are more likely to develop tumours. Sun Exposure Dogs that spend long periods outdoors in intense sunlight are at greater risk for sun-related cancers. Coat and Skin Colour Dogs with: White fur Pink skin Thin coats Sparse hair are more vulnerable to UV damage. How Is Skin Cancer Diagnosed? Veterinarians use several methods to diagnose skin cancer, including: Physical Examination Your veterinarian will assess the size, appearance and location of the growth. Fine Needle Aspirate A small needle is used to collect cells for microscopic examination. Biopsy A tissue sample may be surgically removed and sent to a veterinary pathologist. Imaging X-rays, ultrasounds or CT scans may be needed to determine if the cancer has spread. Treatment Options for Skin Cancer in Dogs Treatment depends on: The type of cancer The location Whether it has spread Your dog’s overall health Common treatments include: Surgery Surgical removal is often the first and most effective treatment for many skin cancers. Radiation Therapy Used when complete surgical removal is not possible or when tumours are aggressive. Chemotherapy May be recommended for cancers with a high risk of spreading. Immunotherapy Some cancers, such as melanoma, may respond to specialised immune-based treatments. Targeted Therapies Modern veterinary oncology offers newer medications designed to target specific cancer cells. Can Skin Cancer Be Prevented? While not all skin cancers can be prevented, there are steps pet owners can take to reduce risk: Limit excessive sun exposure, especially during peak UV hours Keep light-skinned dogs indoors during the hottest part of the day Use pet-safe sunscreen on vulnerable areas Avoid shaving double-coated dogs too short Perform regular skin checks at home Schedule annual veterinary wellness exams Never use human sunscreen products unless approved by your veterinarian, as some ingredients may be toxic if licked. The Importance of Early Detection One of the most important things pet owners can do is regularly examine their dog’s skin. Many skin cancers are highly treatable when caught early. A good rule is: “If you find a lump, have it checked.” Do not assume a growth is harmless simply because your dog seems comfortable. Some aggressive cancers can appear small and innocent in the early stages. Final Thoughts Hearing the word “cancer” is frightening for any pet owner, but advances in veterinary medicine have dramatically improved outcomes for dogs with skin cancer. Many skin tumours can be successfully treated when detected early, allowing dogs to continue living happy and comfortable lives. Regular home checks, annual veterinary examinations and prompt attention to unusual lumps or skin changes are the best ways to protect your dog. If you notice anything unusual on your dog’s skin, do not wait. Early veterinary intervention could save your pet’s life.
Skin cancer is one of the more common forms of cancer seen in dogs, yet many pet owners are unaware that dogs can develop dangerous skin tumours. While not every lump or bump is cancerous, some skin growths can become aggressive and life-threatening if left untreated. The good news is that early detection and prompt veterinary treatment can make a significant difference in your dog’s outcome and quality of life. As loving pet owners, understanding the warning signs, causes, risk factors and treatment options for skin cancer can help protect your dog and ensure they receive veterinary attention as early as possible. What Is Skin Cancer in Dogs? Skin cancer occurs when abnormal cells grow uncontrollably in or under the skin. Dogs can develop many different types of skin tumours, ranging from harmless fatty lumps to aggressive malignant cancers that may spread to other parts of the body. Unlike humans, where many skin cancers are directly linked to sun exposure, most canine skin cancers are not caused by sunlight. However, ultraviolet (UV) radiation can still play a role in certain types of skin cancers, especially in dogs with light-coloured skin or thin coats. Skin cancer can appear anywhere on a dog’s body and may affect dogs of any age or breed, although older dogs are generally at greater risk. Common Signs of Skin Cancer in Dogs One of the challenges with skin cancer is that it can look very different from one dog to another. Some tumours grow rapidly, while others develop slowly over months or years. Pet owners should watch for: New lumps or bumps on the skin Growths that change size, shape or colour Sores that do not heal Red or inflamed skin lesions Bleeding or ulcerated masses Itchy or irritated areas Hair loss around a lump Swelling beneath the skin Growths in the mouth or around the nails Persistent licking or scratching at one area Not every lump is cancerous, but every new lump should be checked by a veterinarian. Early diagnosis is one of the most important factors in successful treatment. The Most Common Types of Skin Cancer in Dogs Mast Cell Tumours (MCTs) Mast cell tumours are the most common malignant skin tumours seen in dogs. Mast cells are part of the immune system and normally help with allergic reactions and inflammation. When these cells become cancerous, they form tumours within the skin or beneath it. Mast cell tumours are often called “the great pretenders” because they can look like almost anything. Some appear as small harmless lumps, while others become red, swollen, ulcerated or rapidly changing masses. These tumours may: Change size suddenly Become itchy or inflamed Cause redness or swelling Release histamine, leading to irritation or digestive upset Certain breeds are more prone to mast cell tumours, including: Boxers Bulldogs Boston Terriers Pugs Labrador Retrievers Golden Retrievers Diagnosis usually involves a fine needle aspirate, where a small sample of cells is collected and examined under a microscope. Treatment typically involves surgical removal. Many mast cell tumours can be cured if detected early and removed completely. However, some aggressive forms may require: Chemotherapy Radiation therapy Ongoing monitoring Veterinarians often recommend sending the tumour to a laboratory after surgery to determine how aggressive it is and whether additional treatment may be necessary. Melanoma in Dogs Melanomas arise from melanocytes, the pigment-producing cells in the body. These tumours are commonly dark or black in colour, although some may appear pink or non-pigmented. Melanomas can occur: On the skin In the mouth Around the nail beds On the lips Skin melanomas are often benign in dogs and can usually be cured with surgery. However, oral melanomas and nail-bed melanomas are often much more aggressive and can spread quickly to the lungs and lymph nodes. Signs of oral melanoma may include: Bad breath Bleeding from the mouth Difficulty eating Drooling Swelling around the mouth Treatment may include: Surgery Radiation therapy Immunotherapy Melanoma vaccines such as Oncept® Early diagnosis is critical because aggressive melanomas can spread rapidly. Squamous Cell Carcinoma Squamous cell carcinoma (SCC) is one of the skin cancers most commonly linked to sun exposure in pets. This cancer develops from skin cells and often affects areas with sparse hair or light pigmentation. Common locations include: Nose Eyelids Ears Abdomen Groin area Dogs with white or thin coats are particularly vulnerable. Squamous cell carcinoma may appear as: Crusty sores Non-healing wounds Raised red lesions Ulcerated skin If caught early, surgery can often be curative. More advanced cases may require radiation therapy or additional treatments. Hemangiosarcoma of the Skin Cutaneous hemangiosarcoma is another sun-related cancer that can affect dogs, especially those with thin fur or pale skin on their stomach and inner thighs. This cancer develops from blood vessel cells and may initially appear as: Red or black skin growths Bruise-like lesions Small blood-filled masses Dogs that frequently sunbathe on their backs may be at increased risk. The danger with hemangiosarcoma is that it can eventually spread internally and become extremely aggressive if not treated early. Fortunately, if detected early and surgically removed, many dogs do very well. Which Dogs Are Most at Risk? While any dog can develop skin cancer, some factors increase the risk: Breed Predisposition Certain breeds are genetically more prone to specific skin cancers. Age Older dogs are more likely to develop tumours. Sun Exposure Dogs that spend long periods outdoors in intense sunlight are at greater risk for sun-related cancers. Coat and Skin Colour Dogs with: White fur Pink skin Thin coats Sparse hair are more vulnerable to UV damage. How Is Skin Cancer Diagnosed? Veterinarians use several methods to diagnose skin cancer, including: Physical Examination Your veterinarian will assess the size, appearance and location of the growth. Fine Needle Aspirate A small needle is used to collect cells for microscopic examination. Biopsy A tissue sample may be surgically removed and sent to a veterinary pathologist. Imaging X-rays, ultrasounds or CT scans may be needed to determine if the cancer has spread. Treatment Options for Skin Cancer in Dogs Treatment depends on: The type of cancer The location Whether it has spread Your dog’s overall health Common treatments include: Surgery Surgical removal is often the first and most effective treatment for many skin cancers. Radiation Therapy Used when complete surgical removal is not possible or when tumours are aggressive. Chemotherapy May be recommended for cancers with a high risk of spreading. Immunotherapy Some cancers, such as melanoma, may respond to specialised immune-based treatments. Targeted Therapies Modern veterinary oncology offers newer medications designed to target specific cancer cells. Can Skin Cancer Be Prevented? While not all skin cancers can be prevented, there are steps pet owners can take to reduce risk: Limit excessive sun exposure, especially during peak UV hours Keep light-skinned dogs indoors during the hottest part of the day Use pet-safe sunscreen on vulnerable areas Avoid shaving double-coated dogs too short Perform regular skin checks at home Schedule annual veterinary wellness exams Never use human sunscreen products unless approved by your veterinarian, as some ingredients may be toxic if licked. The Importance of Early Detection One of the most important things pet owners can do is regularly examine their dog’s skin. Many skin cancers are highly treatable when caught early. A good rule is: “If you find a lump, have it checked.” Do not assume a growth is harmless simply because your dog seems comfortable. Some aggressive cancers can appear small and innocent in the early stages. Final Thoughts Hearing the word “cancer” is frightening for any pet owner, but advances in veterinary medicine have dramatically improved outcomes for dogs with skin cancer. Many skin tumours can be successfully treated when detected early, allowing dogs to continue living happy and comfortable lives. Regular home checks, annual veterinary examinations and prompt attention to unusual lumps or skin changes are the best ways to protect your dog. If you notice anything unusual on your dog’s skin, do not wait. Early veterinary intervention could save your pet’s life.
