Hi Michael,
Novolin N is not a good insulin for cats. It hits hard and fast and does not last the 12 hours necessary for cats.
I would definitely ask your vet to change you over to a much more suitable insulin such as Lantus or Prozinc. These are the two insulins recommended by the American Animal Association. Lantus and prozinc are longer lasting and more gentle insulins and are much more suitable for Indy.
With Novolin N you need to be feeding Indy
1 hour before giving the insulin so he has food aboard when the insulin hits.
So the routine is, when you are hometesting (and I strongly recommend you do test), is to
test, feed, wait 1 hour, then give the dose.
If the preshot BG is below 250 it is recommended you do not give the dose. You can stall, dont feed and see if the BG rises after 20 minutes but I would recommend you post and ask for help if that happens.
Are you giving a couple of snacks of food during the first half of the cycles? With Novolin N I would give snacks at -2 and +4. A snack is a teaspoon or 2 of low carb food.
Here is a link to
USING NOVOLIN N please eat it through thoroughly as it has a lot of information in it.
You will see that the starting dose is 0.5 if you are feeding low carb canned or 1 unit if you are feeding dry food. So it does concern me how much your vet knows about treating feline diabetes. They are not treated like dogs which some vets do as they have little experience with feline diabetes.
Do you have a hypo kit set up in case of low numbers and do you know the symptoms of a hypo?
With testing you will be able to see the blood glucose dropping and do something about it before symptoms of a hypo appear. Once symptoms appear, the BG will be very low.
Here is information about hypo kit and symptoms
HYPO KIT and HOW TO TREAT A HYPO AND SYMPTOMS