In dogs, normal blood sugar levels are 80 to 120, I have seen diabetic patients with values as high as 600. Although diagnosing diabetes is not demanding, treating it certainly is. That said, it is a treatable disease in dogs and most diabetic dogs can lead very high-quality lives. Virtually all dogs with diabetes require insulin therapy. Just as in humans, the insulin is administered by injection.
Most dogs require insulin twice daily to adequately control their disease.
Before you throw up your hands and think you could never give your dog shots, let me say that almost all owners are capable of properly administering insulin to their dogs. The needles used are very small, making the injections quite comfortable. A complete discussion of insulin therapy is beyond our scope here, but there are a few key points you should know. There are many different types of insulin available, be sure you discuss what type is appropriate for your dog with your veterinarian. Insulin should be refrigerated, and mixed gently before administration.