Could be! You might be fighting along side and against some canine buddies soon in
Team Fortress 2. Here's an
update on the TF2 blog that, as always, exhibits that winning Valve sense of humor in announcing something.
From the sounds of it, it the dog will have a cannon that it can use to attack as well as retrieve items for you. I'd love to be able to send a dog out into a dangerous situation to fetch some ammo for me and take out a few baddies along the way as well. Now the question is which class will be privy to a canine companion?