I suspect his smells a difference in you and has associated it with this testing process. Your smell will change as the blood glucose drops after you take the insulin. He has associated all the process!

My Marlin has saved my Dad's life several times, coming to wake me in the middle of the night when Dad passed out from a low glucose level. No training, he just knew something was wrong and I had to know about it.

I hope the stress passes so you can get back to being more regulated.