Blood in the urine of older dogs is usually caused by bladder hematuria or urethral hematuria, such as cystitis, bladder stones, bladder tumors, urethral stones, urethritis or urethral tumors.

Grapes, onions, chocolate and other foods are not harmful to the human body, but they are very harmful to dogs. They may cause red blood cells in the body to rupture and cause blood in the urine. If a small amount of blood is found in the dog's urine , the dog's mental state is relatively good, you can increase the amount of water it drinks to speed up the elimination of toxins. If the blood in the urine is serious, it needs to be sent to the doctor for examination and treatment as soon as possible.

Many dogs are prone to liver and kidney problems as they age due to the gradual aging of various organs in the body. If they accidentally suffer from renal failure, it will also cause problems such as abnormal urination and changes in water intake. Pet owners need to take their dogs to the doctor for examination. If there is kidney failure, it needs timely emergency treatment through infusion, catheterization, etc.