I tried to see if this topic has been addressed before, but didn't find anything. My apology if it's a repeat...
I try to always have Molly's license and rabies tags with me, whether we go for a walk, or are out-and-about in the car. I figure they're good to have in case of an emergency, or if there are other pups around and their owners are wanting to know that the dogs are rabies protected.
It was becoming a hassle, changing the tags from harness-to-harness as we decided what Molly would wear on a given day.
So, I went to Home Depot and had some metal tags printed with her township license number, her rabies vaccination number (and the vet's phone number).
Although the numbers change yearly, the cost was minimal, so now we have tags on each of her harnesses. My hub and I also have duplicate tags with our house and car keys.
So, for what it's worth, I thought I'd pass it along!
Maureen and Molly