As a further point, I do believe that the green-collar job piece of this is important.

CNN: Part 1 of CNN Democratic presidential debate

The owner dials their pooch's number and after one ring, it automatically connects to the phone on the dog's collar, allowing the dog to hear its master's voice, transmitted out of a speaker built into the collar-piece.

CNN: Give a dog a cell phone

We were all ready to start harshing on the Top Tag Pet ID--a USB thumb drive that contains vital info about your pet--because it seems pretty silly to assume that a lost animal's rescuer would know what the hell to do with that small piece of plastic dangling from Tinkerbelle's collar.

ENGADGET: Top Tag Pet ID USB thumb drive