What is the normal urine output rate for a cat or dog?

• A. 0.5-1 ml/kg/hr
• B. 3-4 ml/kg/hr
• C. 5-6 ml/kg/hr
• D. 1-2 ml/kg/hr

Answer: (D)

Understanding urine output rate helps gauge kidney function and hydration. For healthy cats and dogs, normal urine production is about 1 to 2 milliliters per kilogram of body weight per hour. This range indicates kidneys are filtering well and the animal is adequately hydrated. Values significantly lower suggest oliguria from dehydration, poor perfusion, or kidney disease, while values significantly higher indicate polyuria, which can occur with conditions like diabetes mellitus or diabetes insipidus, or with diuretics. Among the options, 1-2 ml/kg/hr matches the normal range, while 0.5-1 ml/kg/hr is too low and 3-4 or 5-6 ml/kg/hr are too high.