Dorsal Dragons are so named because they have large fins along their backs that can be raised and lowered at will. They use these fins to regulate body temperature; they raise them to cool off when they become overheated. The bright colors on the fins double as a means of attracting mates.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Doctor Who really likes horse dragons. He feels that he should be one as well. Therefore, he practices acting like the other horses whenever he can. The main thing he has trouble with is stomping his feet- err... 'hooves' he says. He does it how all the horse dragons do it, but he can't produce that same loud clopping sound. For now, he satisfies himself with just doing the same action in the same pose as the others. At first, MessengerDragon's horse dragons were hesitant to accept him. However, after seeing how much it meant to him, they allowed Doctor Who to join their herd. He proved himself worthy of it, running as fast as any horse. The herd now treats him as one of their own. He has even managed to receive the loving attentions of a beautiful silver shimmer who wished for an affectionate horse to be her lifetime mate. Doctor Who is really happy with his wife and friends.