Dragon spirits are somewhat prominent in the Spirit World of the film Spirited Away. The only known one is Haku (Nigihayami Kohaku Nushi). To a lesser extent is the Unnamed River Spirit that was initially believed to be a Stink Spirit.

Haku in dragon form

Haku in his dragon form

Based on Haku's appearance in dragon form, it is possible that some dragons appear elongated and slender, almost dog-like and are capable of flight without the need for wings (these are the Asian-based dragons).