If you have a dog with a penchant for running away, the Retrieva collar might be of interest to you. I remember interviewing a representative of the company at Crufts 2008 and thinking what a well thought out product it was. Not only does it let you track your dog, it is tamper proof, and will withstand water should your dog take a swim while wearing it.
So not only will it help if your dog simply wanders off, but it should help cut down on the number of dogs stolen. And that can only be a good thing.
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