I do not know about the technology, but I like the idea of using something that already exists. I have a question: Does this idea have any specific context where it can be implemented? Any conflict or country specific? Thank you for this idea!
Like this idea! I can add: Just as you train a dog to be a guard dog, we could train dogs to detect the signs of emergency, acting in some way (barking, jumping, etc), in case of not having the device.