Print this out, read it, then share it with your vet, along with a
written statement that you want to use Lantus. Levemir, or Prozinc.
http://www.felinediabetes.com/AAHADiabetesGuidelines.pdf
Some folks "hear" better with their eyes once they see what you mean.
Also, Merck Veterinary Manual Online
Diabetes (bolding mine)
"
It is usually preferable to have blood glucose testing performed at home to avoid changes in the pet's routine and the stress of in-hospital testing. Studies in both dogs and cats have shown that at-home monitoring improves glycemic control and increases the likelihood of obtaining remission in diabetic cats. In cats, high-protein diets along with insulin therapy are initiated, with reevaluation in 5–7 days. In newly diagnosed cats,
insulin glargine is the insulin of choice. Glargine is a long-acting basal insulin.
Used in conjunction with high-protein, low-carbohydrate diets, it is associated with remission of diabetes and discontinuation of insulin therapy in 80%–90% of cases within the first 3–4 mo of treatment. NPH, lente, or PZI insulins may also be used in cats, with starting dosages ranging from 1 to 3 units, bid. However, these insulins are not associated with high rates of diabetic remission."