Not _all_ dragons have wings if you do some research on them, there are at least two subspecies of dragons:
The European dragon, derived from European folk traditions and ultimately related to Balkans and Western Asian mythologies. Most are depicted as reptilian creatures with animal-level intelligence, and are uniquely six-limbed (four legs and a separate set of wings).
The Chinese dragon, with counterparts in Japan (namely the Japanese dragon), Korea and other East Asian and South Asian countries. Most are depicted as serpentine creatures with above-average intelligence, and are quadrupeds (four legs and wingless).
I don't mind Spike having wings, but having wings is not gonna change anything.