Early Detection of Pet Cancer: Warning Signs and Common Types

Cancer is one of the most serious health challenges pets can face, but catching it early can make a real difference. Pet owners who recognize warning signs and understand common types of cancer can help their pets get treatment sooner—improving outcomes and quality of life.

Why Early Detection Matters

Finding cancer early allows veterinarians to diagnose it before it progresses, giving pets a better chance at effective treatment. Early detection often means less invasive therapies, higher success rates, and a greater likelihood of maintaining comfort, mobility, and overall well-being.

Warning Signs of Cancer in Pets

Some cancers develop quietly, so it’s important to watch for subtle changes. Signs to look for include:

• Lumps or bumps under the skin that grow or change shape
• Swelling, especially in limbs or near the face
• Sores that don’t heal
• Unexplained weight loss or loss of appetite
• Unusual fatigue or decreased activity
• Trouble breathing, coughing, or swallowing
• Changes in urination or bowel movements
• Unexplained bleeding or discharge
• Changes in behavior, coordination, or mobility (such as weakness, stumbling, or difficulty walking)

If you notice any of these signs, contact your veterinarian immediately. Early evaluation can make a meaningful difference in treatment outcomes.

Common Types of Pet Cancer

Certain cancers are more frequently seen in dogs and cats. Being aware of them can help you stay alert to changes in your pet’s health:

• Skin Tumors: Lumps or growths on the skin, including mast cell tumors and melanoma
• Lymphoma: Cancer of the lymph nodes and lymphatic system, often causing swelling, weight loss, or lethargy
• Bone Cancer (Osteosarcoma): Usually affects large-breed dogs, causing limping or pain in a limb
• Mammary Tumors: Common in unspayed female pets; early detection improves treatment success
• Hemangiosarcoma: Aggressive cancer of blood vessel cells; may develop internally without obvious signs until advanced, sometimes causing sudden weakness or abdominal swelling
• Brain and Spinal Tumors: Can cause seizures, subtle behavioral changes, or mobility challenges that may appear gradually

Routine Exams and Vigilant Observation Are Key

Regular veterinary check-ups are the best way to catch cancer early. The DoveLewis Oncology team works closely with families and the pet's primary veterinarian to monitor pets and guide treatment plans that prioritize comfort, quality of life, and each pet’s unique needs.

By staying aware of early signs, understanding common types of cancer, and combining vigilant observation with expert veterinary care, you give your pet the best chance for timely intervention and improved outcomes.