I use www.akccar.org for registering all of my chips, regardless of brand. I stopped using the Home Again registry when they started trying to get the annual fee. I typically use Home Again or the AKC chips these days, all my puppies are chipped before going home. There is no reason to re-chip your pets, just have the chip number (and maybe brand) and you can do it online yourself with whatever registry you choose. Home Again will also accept any brand of chip in their registry. Not sure about Avid or some of the others. But definitely get them registered in your name, not the vet's.