Why has my pet developed cancer?

as in human medicine, we often cannot explain why one pet develops cancer and another one does not. Research has shown that certain risk factors increase the chance that a person will develop cancer. It is likely that many of the most common risk factors for cancer in people also affect our pets, including age, sunlight (ultraviolet radiation), certain chemicals, some viruses, certain hormones, poor diet, lack of physical activity, being overweight or a family history of cancer. Whilst many of these risk factors can be avoided, several factors may act together over time to cause normal cells to become cancerous. When thinking about the risk of cancer remember that not everything causes cancer. Having one or more risk factors does not mean that an individual will get cancer. Some individuals are more sensitive than others to the known risk factors.