SFO launched the program last year. The San Francisco Society for the Prevention of Cruelty to Animals (SPCA) is responsible for choosing the animals, which are certified through their Animal Assisted Therapy (AAT) program to roam the terminals.
There is Poquito, also known as Poco. He was rescued from Mexico and gets excited when his handler tells him they are going to SFO to "work."
A crowd favorite is Jennings (named for journalist Peter Jennings, of course). Jennings is a handsome and happy golden retriever who flirts with all the passengers.
If you're worried about missing the Wag Brigade, hop on Twitter. That's how we found them.