I saw a message in a local vet advertisement that said "We now offer micro-clipping." Just out of curiousity, what is this? I did a google search and couldn't find anything...

Micro clipping is really micro chipping:

"Dog Travel Tip : Micro clip your dog in case she gets lost far from home

Your dog should be microchipped and her license and identification tags engraved with your name and address. You might want to add a neighbor or relative's contact information in case someone calls while you are away."

This was on "article city".