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The dog may not be responsive to that type of insulin. Ask your vet if they feel like a change in the type is indicated. Make sure you are following the strict guidelines for feeding a restricted diet. (Much like us, if the dog is getting treats...the sugar level will stay high).
Lastly, when they are diabetic they have lots of glucose in their urine...which grows lots of bacteria. Tell your vet tomorrow about the urine, because he will need to be started on an antibiotic.
Let me know if you are having trouble..but you should have access to the answer until you close the question.
Your welcome...and good luck!!