Kaji wears a collar 24/7 for the sole purpose of holding tags. When we go out for walks, he wears a harness which is where I attach his leash. He's walked out of our home before completely naked, in the middle of the night. He had no ID on him and I was petrified that I wouldn't see him again. Luckily I found him in the condo complex 45 mins later. Never again will he be without tags.
Here's another reason to have identification on your babies at all times.
http://www.yorkietalk.com/forums/gen...hree-gone.html