Dogs with malignant tumors can live for up to one year, and the specific time depends on the location and nature of the tumor, the dog’s physique, and the treatment. Generally, elderly dogs are more likely to suffer from tumors. Owners need to pay more attention. If they find that their dogs are in poor spirits, have a loss of appetite and other abnormalities, they should take their dogs to the pet hospital for examination and treatment in time. This can slow down the progression of tumors and reduce the risk of cancer in dogs. Dog pain.