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I am sorry to hear that Fritz is diabetic.
I would not switch unless you have to. We can still get Vetsulin, and it is available:
If you switch to Novolin, you will have to start over regulating him. He may or may not do well on it. If you switch, I need to know his weight to recommend a dose, but basically I would start at a lower dose than the 11 U you are giving, and then do a blood sugar reading a few days after starting it to decide whether to lower or raise the dose.
Let me know if this helps, and what other questions you have.