If the diabetes has not gone undetected for a long time, there is a chance he may go into remission - if you can get his blood glucose stabilized fast. The neuropathy in his hind legs could also improve when you get his high blood glucose under control. If going with Lantus means you get it under control faster, his chances of remission are better. If he goes into remission, you won’t be giving insulin for the rest of his life, wo one vial might be all you will have to buy. You will need to check his blood glucose even when in remission, but you won’t have to use insulin. I was able to use the cheaper insulin and get my cat into remission, but I was available 24/7 to test and give shots and food. My cat’s diabetes returned and now I am considering switching to Lantus or one of the others if I can’t get his blood glucose evened out with the cheaper Novolin or Vetsulin. You may want to post over in the Lantus group and see what the benefits of Lantus are. Then you can decide. Do take action though. Every day that his blood glucose stays high increases his chances of permanent damage and decreaces his chances of remission.