This Israeli technology has been around for a while but is worth reporting here. Israel’s Bio-Sense Technologies has a dog-alarm that can alert you when your dog senses that an intruder is approaching. It can also be used to tell you if your dog is unwell. Maybe even if it wants to go “walkies”?
http://www.youtube.com/watch?v=3No94bWvKoA
http://www.bio-sense.com/