Hi Peggy,
I agree with Joanna, a curve at the vet might give you some insight into how the insulin is working.
The numbers will be higher from vet stress but the insulin should work the same way, you'll be able to see how much of a drop he's getting at the given +#'s and then you can do the math.
You won't lose any more fingers and Mickey can be mad at the vet and not you.
It sounded like a good idea to me.
Robin