Wyverns versus 'True' Dragons
For context: I have only explicitly read Of Blood and Fire but I don't care about general spoilers.
I was watching a panel with Ryan Cahill, Robin Hobb, and Brandon Sanderson on YouTube. Ryan mentions that Christopher Paolini gives him playful jabs about not writing 'true' dragons.
I know Valerys is a wyvern, by definition, but is that true for every dragon mentioned in the series? Or is it a mix of 'true' dragons and wyverns?
Definitions I'm using just to make sure:
Dragons: 4 legs, 4 wings
Wyverns: 2 legs, 2 wings (conjoined front appendages with the wings)