I had my, now deceased, lovely sheltie microchipped and she got out at age 9 and was gone a week but the person who picked her up took her to vet and mentioned she found her and they scanned and brought my BABY back!!! Actually the lady thought she was much younger and was keeping her but when she mentioned that the vet scanned her and wouldn't let her take her back.I sent her $ none the less because she kept her from getting hit by a car.I never ever ever thought in a million years I'd be using that chip. But I now strongly believe in them!!!