Do you know if they are starting insulin tonight?
I
f they have NOT started insulin, you can try to remove all dry food from his diet as soon as possible. Be sure to retest glucose after a few days off dry food, because his insulin needs will change.
If they have started insulin than you need to
learn to test his glucose before you change his diet, so you can moniter his bl glucose levels, and intervene if they fall too low. Hypoglycemia is an emergency that you need to be prepared for (read permanent stickies)
Since he is used to eating canned Friskies you will need to increase the number of cans he eats. Dry food has more condensed calories which you will need to replace. Friskies is Ok but the rice in it isn't great, Search for Janet and Binky to find a list of low carb food.
Some diabetic cats have a serious condition which can be detected through ketones excreted in their urine.
Ketodiastix or ketostyx are available without a prescription at any pharmacy window. Directions are on the bottle. Basically you dip the strip in fresh urine and it tells you whether your kitty is excreting ketones. Ketones are a serious emergency and need vet help immediately. Some folks collect pee with a ladle, others are able to run it through a stream while he's going, some put plastic wrap in the litter box. you just need a drop. If you get positive ketones, you are off to the vet without delay....
Home testing glucose is crucial. Many folks seem to like the Relion meters available at Walmart (without a prescription) and the strips are more reasonable than most. Look for stickies/videos in the forum that explain tips for successful testing. It really isn't hard. You want to test his blood a minimum of before every shot. and occasionally collect data every 2 hours to see what is really going on, or at least as often as possible. When you get numbers, post them as : +1, +2, +3 etc hours since the last insulin injection, rather than clock hours (we cover every time zone) There are posts in the tech forum to put up spread sheets linked to your signature so everyone can see his readings.
Regardless which insulin your vet uses, be sure to learn about it (duration, nadir, onset)
http://www.Prozinc.us has useful videos and FAQ which will help you learn injections etc.
Sorry, it 1 AM here so I'm done. :shock: Others will check on you as well