15/03/2026
Common Types of Cancer in Dogs
Cancer can affect dogs in different ways depending on the type of cancer and where it develops in the body. Understanding some of the most common forms can help pet owners recognize warning signs earlier and seek veterinary care promptly.
In this post, we highlight several types of cancer commonly diagnosed in dogs.
Lymphoma
Lymphoma affects the lymphatic system, which is part of the immune system. It often causes enlarged lymph nodes and may be accompanied by weight loss, lethargy, or loss of appetite.
Mast Cell Tumours
These are among the most common skin tumors in dogs and often appear as lumps or bumps on the skin. Because they can resemble harmless growths, any new lump should always be evaluated by a veterinarian.
Osteosarcoma
Osteosarcoma is an aggressive bone cancer that frequently affects large and giant breed dogs. It often develops in the legs and may cause limping, swelling, and pain during movement.
Hemangiosarcoma
This cancer develops in the cells lining blood vessels and commonly affects organs such as the spleen, liver, or heart. It can progress silently, which is why routine veterinary monitoring is important.
Mammary Tumours
Mammary Tumours occur in the mammary glands and are most commonly seen in unspayed female dogs. They often appear as lumps along the abdomen or near the ni***es and should be examined promptly.
Every cancer behaves differently and requires professional diagnosis and treatment planning. If you notice unusual symptoms such as lumps, swelling, changes in behavior, or unexplained illness, schedule a veterinary examination.
Early detection plays an important role in improving treatment options and supporting your dog’s quality of life.
🐶 Wuff’s Canine Health Clinic
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