I have always kept a collar with an ID tag on Calleigh. She is chipped, but if someone found her, my info and telephone number is right there. My concern is that some day she would run out when someone comes. I always watch her very carefully, but I'm a worry wart.
I put a cat collar with a bell on her when she was a puppy. One afternoon the bell was gone. I looked all over the house and yard where we were walking. I was afraid she had swallowed it. I called the vet and she had to go in for an xray just in case. No more bell for us.
She seems to really like her collar. After her bath she comes right over for me to put her collar back on. It's so funny.