Well, Marley is a rescue, SeaBreeze and I do think they routinely chip them at the shelters now. With breeders perhaps it's a choice. My concern is this; Marley was chipped in Kentucky and when it was thought she wasn't adoptable, (oh so wrong), she was shipped to a kill shelter here in Jersey and red tagged for euthanasia. Fortunately an outfit called, Orphaned Pets, Inc. visits these kill shelters regularly and immediately grabbed her. She was fostered briefly and we found her on line. What a sweet gift from God she is. But, she does have a tendency on occasion to roam away and if she slipped her collar, was found and scanned, she'd wind up back in Kentucky, I fear. Of course, they'd eventually track her back to us, but she is very sensitive and I'd never want to go through all that. Somehow there should be a way to update the chip I would think via technology.