The cat's urine is normal but the urine is brown. It may be caused by kidney disease or systemic hemolysis. A normal cat's urine should be light yellow. If brown appears, kidney disease is more likely and more serious. It will cause the death of the cat in a short period of time, so you need to take the cat to the pet hospital immediately for examination, confirm the cause, and treat it promptly to avoid delaying the condition and causing life-threatening consequences.