Cassidy has a leather collar with her tags, rabies and ID.
  Her ID tag has:
     Cassidy
  I belong to
    My name
   Address and phone number

Then she's got another collar with her name and number engraved on the collar. If I want her to be silent I will use the collar without tags, but if I want her to jingle, then I use the other one [;)] I really should have her rabies on whatver collar she is wearing, though.

Niether of them have microchips, but Mirelle has an ear tattoo, and a tag with her registration number with Canine Companions for Independence, and then their phone number. I'm getting her a collar with her name on it, just for fun, since I won't get it with the phone #. That's because when they take her back, she can keep the collar she's got if they want it.