13. CANCER (Lymphoma)
Illness: Lymphoma is a type of blood cancer that occurs when white blood cells begin behaving abnormally.
Symptoms: Lumps, bumps, abnormal odors, abnormal discharges, non-healing wounds, weight loss, change in appetite, coughing, lethargy, evidence of pain
Who's Affected & Why: According to WebMD, fifty percent of dogs over the age of 10 develop cancer at some point. It is also the leading cause of death in dogs over the age of 10. The most common type of cancer dogs are diagnosed with is lymphoma (a tumor of the lymph nodes). As far as breeds go, Golden Retrievers, boxers, flat-coated retrievers and Bernese Mountain dogs have a strong incidence of cancer.
How to Prevent & Cope: There are many successful treatments, including canine chemotherapy, available to help those dogs diagnosed with cancer. (Care2)