The Team Fortress 2 Blog hints at upcoming plans for Team Fortress 2, reproducing some paperwork related to a new guard dog class for the teamplay shooter, or more specifically, #1308 - 'GUARD DOG' Item Retrieving, Cannon-Appended Canine Unit." The accompanying Guard Dog Update (which is not on the TF2 Blog) has full details on the dog's uses, which are offensive, defensive, and support (including being a Jarate dispenser). The update includes a complete list of related achievements, but looks like it is likely a spoof. According to a forum post here: "This fake update gained immense popularity on the steam user forums just over the last few days, so much that Valve decided to do a tongue-in-cheek acknowledgment of it on the main blog."