Tango's been chipped a couple times, and neither of them read on her for some reason. She's tattooed though in her ear, so I guess that's somewhat of an alternative. I'm not going to bother trying to get her chipped again, as I don't like the idea of multiple foreign bodies floating around inside her. My next dog will be chipped though, and hopefully it'll work on her. Morgan is chipped, and I'm not sure if Winston is. I don't think Tia is either, but I'm not sure. Piper is not, but will be when she goes to the vet next. I like the idea of a chip, but prefer tags and tattoos simply because both of those are clearly visible ad most people don't even know about microchips.