Creatinine Levels In Dogs Blood. Normal bun levels in dogs seldom reach higher that 25 to 30 mg/dl. High values for both bun and creatinine indicate that the kidneys are not working well and may be in failure.
How is creatinine measured and interpreted? Their creatinine concentration at this stage will range between 2.1 and 5.0 mg/dl. There is no known variation in blood creatinine throughout the day in dogs, but the possible effects of meals should be considered.