Our new lab/golden mix puppy we rescued from the SPCA shelter already has the chip in him. It's standard from here out at this shelter. Too many new holiday pets around this time get abandoned on the porch of the pound or intentionally lost by about February, so they do it now as soon as they get a dog to put up for adoption.
As for not being old enough... our puppy was 8 wks. when he had the "chip & snip" done, so no dog is too young.
There is more info about it at 24petwatch.com...
As for the "mark of the beast"/slippery slope theorists out there... This could very well be the beginning of this type of thing, except that a family in Minnesota volunteered to have chips inserted over a year ago, and it made the AP. Also, people in some of the Nippon (sp?) areas of Japan have been chipped for a decade or more.
On the other hand, the Revelation stuff... will happen either way.