In the same way that millions of people cope with diabetes, so too, does the disease affect canines. Specifically, the disorder is called diabetes mellitus (DM). An insulin deficiency prevents your pooch’s body from metabolizing glucose effectively. There are two varieties of DM: Type I and Type II. The former is the most prevalent type (99% of dogs with DM suffer from this type) and occurs when the body doesn’t produce enough insulin. The latter occurs when insulin is manufactured but your pooch’s body isn’t able to use it properly.