Starbuck and River did not just reserve their barking for the other dog. Instead, they barked at everyone to let them know that there was another dog nearby. Starbuck came right up to me to bark a few times while making direct eye contact. She really wanted me to know that, not only was there another dog, but that she was going to take care of the situation.
I believe that it's the husky in them, but both of my dogs like to talk to people when they want something. Usually its more of a gruff grumble or whine, but they will certainly bark when they really want everyone's attention. Generally, I like that they talk to us, but the barking can get rather loud, as it did today.
Hopefully, they won't shout so much the next time they get to hang out with another dog.