They have them for cats- there seems to be a race to develop the best one: http://www.appcessories.co.uk/wheres-that-darn-cat-the-best-gps-cat-tracker/ http://

They have them for cats- there seems to be a race to develop the best one: http://www.appcessories.co.uk/wheres-that-darn-cat-the-best-gps-cat-tracker/ http://www.appcessories.co.uk/wheres-that-darn-cat-the-best-... "Pawtrack needs to be able to be working in a compatible country, and in addition needs to have GPRS (2g) connectivity to allow live updates. The cat tracking collar will work in 171 countries, including USA/ Canada, the EU, UK as well as Australia and New Zealand. In addition, the cat GPS collar will transmit via home Wifi." "The Pawtrack cat GPS collar takes about 4 hours to be fully recharged, and once charged will last up to 3 days once the Wifi modules and Intelligent Power Control settings are switched on." Maybe you could wire in a larger battery.