My friends have taken on a 3 year old Rotti rescue, he was playing a game with me the other day and suddenly turned round sat in front of me and began to nudge me insistently, Now I new I was heading low as my pump had alarmed 15 mins earlier. I never thought any more of it until Dino came and put his head on my lap two days later and just stared at me. Again I knew I was starting to get low and had been eating a couple of jelly beans to make sure I didn't hypo. (basal was in the process of being checked) I asked his owner if she had any treats for him as he such a good boy.
I've never known a dog that wasn't mine tell me to sort a low out, so very impressed.