I need advise. My Siamese was diagnosed with feline diabetes in February of this year. The vet put him on Hills Prescription W/D.,and vetsulin. My cat Zorro has went from 1 unit and now is up to 6 units q 12 hours. His glucose levels range from 450 to 5 00 . I asked the vet if I should switch to a canned food and she told me that dry is fine., yet every thing I have read says NO DRY FOOD. Zorro drinks a lot of water and urinates a lot. He also has weakness in the back legs. 2 days ago the vet suggested that I try Science Diet M/D. Any advice would be greatly appreciated. Thank you.