IMO, there's no reason in the world not to have your pet micro-chipped - in my area, the shelters, vets and police stations are able to scan for a chip - and, as mentioned, the chip company has the owner information.
If you wonder about possible health issues, ask your vet - I believe 99.9% of vets will say the benefits outweight the miniscule health risk. Some people have quasi-theological/political reasons against chipping - again, for your own pet, you have to ask yourself if your responsibilities as a pet parent outweigh any non-health-related conceptual issues you may encounter.
My two were chipped by the shelter - both of them were found as adult strays (declawed, no less, so you know they had families). But neither were chipped so their original owners had neither the pet returned nor closure. Their loss, I'd say.
If you wonder about possible health issues, ask your vet - I believe 99.9% of vets will say the benefits outweight the miniscule health risk. Some people have quasi-theological/political reasons against chipping - again, for your own pet, you have to ask yourself if your responsibilities as a pet parent outweigh any non-health-related conceptual issues you may encounter.
My two were chipped by the shelter - both of them were found as adult strays (declawed, no less, so you know they had families). But neither were chipped so their original owners had neither the pet returned nor closure. Their loss, I'd say.