Easy.
http://www.amazon.com/Tagg-GPS-Pet-Tracker-Attachment/dp/B0077I42S4 ?
http://www.amazon.com/Tagg-GPS-Pet-Tracker-Attachment/dp/B0077I42S4
That's really sad! I dont have any tips for now, but for the future, http://www.amazon.com/Tagg-The-Pet-Tracker-Master-Kit/dp/B0077I42S4/ref=sr_1_2?s=pet-supplies&ie=UTF8&qid=1349632830&sr=1-2&keywords=pet+gps