Just as humans have a number of common signs of cancer, there are also common signs of cancer in dogs:

New and abnormal growths that persist or continue to grow

Bleeding or discharge from body openings

Difficulty breathing, urinating, or defecating

Difficulty eating or swallowing

Loss of appetite

Offensive odor

Persistent lameness or stiffness

Reluctant to exercise or loss of stamina

Sores that will not heal

Weight loss

The signs and symptoms listed above are also seen in many other diseases or illnesses affecting dogs, and do not necessarily indicate cancer. It is important to promptly bring any concerns you may have to your veterinarian’s attention.