When someone finds your dog on the loose, they see the PawPrints ID usb flash drive attached to his or her collar. (no need for a separate collar)
When they put the flash drive in, windows will open a menu for  them to "open folder to view files"
There will be only one file on the flash drive called
"double click this graphic.png"
When they double-click the file it will do this:
Try    it