It is vital to regularly monitor your dog's glucose levels if they have diabetes - but it isn't just about monitoring, it's about understanding the results. A healthy dog should have around 100–250 mg/dL but this can differ throughout the day, diabetic dogs will have different glucose levels - usually around 90-216 mg/dl in a 24 hour period. There are many factors that can affect blood glucose levels and these include: stress, weight gain or weight loss, a change in an exercise regime, medication, disease (other than diabetes), and progesterone. Your veterinarian should be made aware of any changes in diet/exercise if you have a diabetic pet. Take a look at our review of the best food for diabetic dogs.