A relatively new type of insulin, called glargine, helped revolutionize treatment of diabetes in cats. Glargine releases slowly at relatively constant rate, which helps maintain more steady blood sugar levels and minimize abnormal highs and lows.
Insulin Glargine is now tested for treatment of dogs.
Information is scarce, but according to a this study it seems that twice daily, subcutaneously administered insulin glargine might be used as an alternative to other insulin types.
It seems to be an option worth considering for presently poorly regulated diabetic dogs.
A New Insulin for Diabetic Dogs
Use of insulin glargine in dogs with diabetes mellitus
Treating Diabetic Dogs with Insulin Glargine