Welcome! We have a very successful protocol for feline diabetes:
1. A slow, long lasting insulin. Lantus, Levemir and ProZinc are popular as they have a slow onset; they are not harsh and they are easiest to use for regulation. Humulin and Canninsulin are less popular because, in most cats, they have a rapid onset and don’t last as long. We like new diabetics to start low and go slow. That is, start at a low dose of .5 or one unit twice daily every 12 hours. And increase slowly, by .25 or .5 units as the numbers indicate.
2. A low carb, wet diet. We like to feed under 8-10% carbs. There are several food charts you can use: [=http://www.catinfo.org/docs/Food%20Chart%20Public%209-22-12.pdf] Dr. Lisa’s food chart [/url]
Hobo’s Food Chart
Whatever food you can afford that your cat will eat in that lower range. BUT DON'T switch foods without home testing first. The blood sugar levels can really go down, fast. If he is having tummy troubles, you might slowly transition from dry to wet. Beef does seem to cause issues in some cats so maybe avoid those at first.
2. And most importantly, hometesting. We think cats tend to be stressed at the vet and we know stress raises blood glucose levels. So we test our cats at home. We use human glucometers and test on their ears or paws. Here is a video that shows you how it is done:
Video for hometesting The problem with your vet testing once a week is that the numbers can change suddenly. There are dozens of threads on this site about a cat suddenly having a lower than usual preshot number and the owner having to reduce the dose. Here is one today:
http://felinediabetes.com/FDMB/viewtopic.php?f=28&t=91312 We wouldn't get insulin from the doctor and just blindly shoot our 2 legged child for a week before taking him in for a check up. We do the same for our cats.
Do some reading. Ask some questions. Let us know how we can help.