I am new to this site. I am interested in information from people who have dogs with diabetes. I have a 4 year old Lab/Chesapeake mix who was diagnosed last year. None of his littermates have diabetes. He has never been overweight and is young for a big dog to develop diabetes. We are now up to 30 units of Humulin N (U 100) twice a day and he still spikes in the 500's on his sugar. He only eats his "diabetic" dog food. Any tips? Also any good place to buy his insulin cheaper thazn $57 a bottle? Thanks, MO