Abstract
When talking about cancer, we know that there is an increase in cases in animals, including humans. Due to the close contact with people, there is a greater emphasis on the study and treatment of cancer in companion animals, since by living under similar conditions and developing the same types of cancer they can function as sentinels and models for their study. Cancer development revolves around alterations of genetic material, environmental influence, and interactions of the immune system. Here is a review of some carcinogenic factors inherent to the individual, such as race, gender and age, and external factors such as pollutants in the environment, in the air, water and land, and even in food. Ionizing radiation affects DNA and causes cancer, and there are other lower-energy forms of radiation that must be studied to prove or rule out their long-term carcinogenic effect.
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