Laura Boffi, a student at the Copenhagen Institute of Interaction Design has a great invention for your dog. The invention is called messenger dog concept, a voice and text messaging device with internet and gps feature that could be worn by your dogs to search for help in case of emergency or simply as a messenger to your children or to reach someone your dog also familiar with.

You would also find this gadget helpful especially if you love hiking and outdoor activities such as camping or during a disaster, in the mountains. Simply type in your message or record a voice message. The GPS device will automatically records your geo-location and inform the message recipient.

Messenger-Dog

No info how much this messaging device worth, but an interesting prototype experiment on NADA mobile seems pretty much resemble this type of technology.