Tobey is 14 and has been doing well for the two years since his diagnosis. He was on Lantus until the new insulin pen came out and I started using that. But I have not been able to find a vet who knows how to dose a cat with the new, more potent insulin that the pen uses. As you surely know, insulin is horribly expensive. I started using the new pen because I received a sample. Now, I'm searching for a vet because the vet who diagnosed my sweetie has retired. I'd love to hear from the group. I don't know anybody who has a cat or dog with diabetes.