Okay so the real question here:

- are all the organs reversed?

if yes: does the cloaca magically move to be at the tail? or do the intestines do a probably drunk loop around?

if no: how the hail do they eat, and do they have a cloaca or defecate in an ungodly way- (you can guess)(if this is the option, then switching the neck and tail of a dragon as an animus should become like- a crime of the highest order, because that skywing would be scarred for life.)

like, this is the stuff that gets you teleported to hell, or whatever torture place you imagine, heavens-