The normal blood sugar levels for dogs range between 75 and 120 micrograms, according to petMD. Blood sugar levels above this normal range may indicate hyperglycemia. Levels below this normal range may indicate hypoglycemia, reports WebMD.
Symptoms of hyperglycemia in dogs include increased thirst, frequent urination, weight loss or dehydration. Symptoms of hypoglycemia in dogs include loss of appetite, decreased energy, and confusion, according to petMD. Diabetes occurs frequently in dogs. Type I diabetes commonly requires daily insulin injections for maintaining blood sugar balance, states WebMD. Female dogs and those who are obese have a higher risk of developing insulin-dependent diabetes mellitus, asserts petMD. This disease left untreated can lead to damage to the eyes and kidneys, reports The American Society for the Prevention of Cruelty to Animals.