Either Stockton is referring to some other pooch in the game, or he's talking about our little farm buddy -- and given that Dog has never had a name beyond, well, Dog, I'm going to hopefully assume it's the latter. At the moment, the latest release build for the Warlords beta doesn't appear to have any familiar fuzzy friends running around, but I'm keeping my eyes peeled. As one of the more pleasant memories of this expansion, I'm glad we don't have to say goodbye to Dog -- I like the idea of having a loyal buddy at my side. Even if he doesn't add anything to the garrisons themselves, it's more flavor for a system that already has flavor in spades.
If you have yet to get a Dog for your very own, make sure you take a look at the original post on getting him on your farm before Mists is over. With all the changes to reputation so far in Mists, the grind should be relatively easy.