When dogs suffer from tumors, the four most common symptoms are: one is swollen lymph nodes, lymphoma is a relatively common type of cancer, which can cause swelling of lymph node glands; the other is inexplicable lumps , lipoma is very common among dog diseases, so when you find inexplicable lumps on your dog’s body, you should pay attention to the examination; the third is weight loss, if the dog’s food intake does not decrease, but the dog’s weight continues to decrease, the dog Dogs may suffer from cancer; fourth, breathing abnormalities. Dogs suffering from cancer are generally not in good spirits and breathe heavily.