Type 1 diabetic here (so obviously on insulin). That's amazing Adie can sniff out when you are going low, especially when they come on quickly or if you are hypo unaware! A monitor only tells you where you are at any given point in time, not if you are on the way up, down, or stable, which people without diabetes can't quite understand the importance of knowing. I know some people like CGMS (continuous glucose monitoring systems), I'm not sure they are quite "there" yet. Of course, most insurance companies won't pay for them either at this point.
I came across this website awhile ago, so it is definitely something service dogs are being used to do:
Dogs4Diabetics - providing medical alert assistance dogs to insulin-dependent diabetics
Good luck!