When you watch this video, it would seem like the Doberman was being possessive of the baby. But owner Lori explains that it was the other dog that was trying to stand over the baby to establish superiority, and Zorro, the Doberman, would not allow it. (Lori explains that if Zorro were being possessive, he would have been more aggressive and vocal.)
After a while, the other dog approaches “appropriately” on his belly, and Zorro let him close to the baby. They are all good friends now.
What a sweet dog! Enjoy the video.