This is interesting its a sat nav collar for dogs. The sat nav device in integrated into a waterproof collar. It uses satellite, telecom and radio frequencies to pin point the location of the dog and then alerts the owner once the animal is on the move. The collar can also send a text message if the dog goes beyond a pre programmed range. Whilst at home the collar can be switched off to save the battery life but it can still send an alert if the dog wanders out of range. The collars which are made by a company called Retrieva will be available in January and start at £250. I wonder whether they will make a version for cats.