In the same week, another person noticed a small lump on their pet's foot. We biopsied this lump and found a cancer. This cancer was unique because it was transmitted in the genes of the parents. In the same week I removed a small nodule from the upper eyelid of a dog. The biopsy called this cancer too.
Cancer is a abnormal growth of cells in the body.
For some reason, the cells begin to multiply and grow but the normal signal that controls this growth doesn't work. So cancer cells are abnormally growing cells from what was normal tissue in the body. Benign cancer tends to grow more slowly and doesn't want to spread throughout the body or move to the liver or lungs. Malignant cancer is much more aggressive. These growths not only grow fast, but they try to spread to other tissues or move to the liver and lungs.