Hi, I am new to posting but I often check in at the web site very helpful. I am the caretaker of Pookie, he is a 14 year old 14 pound neutered Maine Coon male house cat and he was diagnosed with diabetes in July 2010 and has been taking Lantus insulin (vial) ever since and last dosage in January was changed to 5 units morning and 5 units evening which for me EST is between 6:00 am 7:00am and same in the PM. He has no other health issues I feed him the non gravy and sauce forms of Fancy feast and I get grain free dry food but I can't seem to get him and his non-diabetic companion Vegas totally of dry food Kit and Kaboodle which I know is not good but that is what they ate for years with Fancy feast until 2010. My question is how to determine the correct amount of Levemir to give since he has already beenon Lantus? I am doing this without the Vet's approval I just started 10-23-13 with evening dose of Levemir he ate about 5-6 ounces of wet food throughout the night and the next morning I let him eat some and then he vomited all the food up so I decided not to give him a shot and I checked his blood 1 hour later 8:00am and it was 127. I decided not to dose at all because of the vomiting and his normal pre shot level is 299-360. That same evening at 5:30pm I checked his bllod it was 363 so I figured it was safe to dose, but I only gave him 3 units of Levemir instead of the 5unit he normally gets with Lantus. Immediately upon giving the shot he ate 1 ounce Fancy feast and then he vomited this food up and I gave him Pepto Bismal 2 units and hair ball treatment because part of it was hairball.He was fine the rest of the evening and this morning I gave him 3 units of Levemir at 6:45 am and he ate chicken Breast and broth and had no vomiting and about three hours later at 9:30am I checked his blood level (using Alpha Trak Meter) and it was 192. He has been as low as 90 two-three hours after shot. I will also be getting a new meter from Walmrt reli-on hopefully, the Alpha trak is getting old and strips very hard to find and expensive. Is there a chart that gives some guidance on this?