What is the normal blood sugar range for a dog?

In the clinically normal dog, glucose concentration is maintained within a narrow range (3.3 mmol/L to 6.2 mmol/L or 60 mg/dL to 111 mg/dL) (2).

What is a high glucose level in dogs?

The normal level of glucose in the blood is 75-140 mg/dl. Diabetes Mellitus is the only common disease that will cause the blood glucose level to rise above 400 mg/dl. Some diabetic dogs may have a glucose level as high as 800 mg/dl, although most will be in the range of 400-600 mg/dl.