I also suffer from diabetes and there are several monitors out there to warn when levels are out of normal. Also knowing the warning signs of low blood sugar will save your wife every time. I know the symptoms of when my blood sugar drops and quickly alleviate that by eating something or drinking juice. No need for a dog, especially one that costs you $20k. If you and your wife didn't spend 20 G's then I doubt her little dog is a trained diabetic alert dog.