So I spent some time searching for other twitter users since none of my friends are on it yet! I tried 'Vermont,' 'Burlington,' 'dogs,' and finally 'dogster' - jackpot! (For those of you not in the know, Dogster.com is the social networking site for dogs - yeah, really.)
My profile picture is of Roger, but I'm tweeting as myself. The search results for 'dog' and 'dogster' seemed to be a mix of either that or people actually tweeting from their dog's POV. There were tons of users with their dogster profile listed as their personal website, and Roger and I made friends with a 'houla girl and her mom!