Here in CA, animals that are chipped cannot be put down or adopted out until every effort is made to contact the info on the chip, all the shelters and vets around here have scanners.
I will always get my pets chipped. Tags fall off, majority of the lost dogs in the shelter do not come in with collars or tags and everyone says " I never thought my dog would be lost "
Also in a lot of cases dogs arent lost in their home town and end up at a shelter in a different town.
My aunt lost her dog and was on vacation, it went to the shelter and was put down after the waiting period ( she wasnt even back from vacation and her petsitter only looked in the closest shelter)
If she had a chip, her dog would still be alive. For the $30 it takes to get a chip.. it seems like a given to get one... My aunt went out and got her other dog chipped the day after she found out her dog was put down.. I'd been telling her for 4 years to get her dogs chipped.
My sister hadnt gotten her dog chipped because she was under the impression your dog had to be under anesthesia to do it. That' not the case although many vets do it when a dog is under getting neutered/spayed.. just because it's easier. In actuality a chip is just like a shot, it's injected under the skin the same way , all 3 of my dogs were chipped at a shot clinic, only one of them yelped when it was done but quickly forgot.
Do it.. don't regret it later...
All mine are chipped, collared, licensed and tagged.
Nancy