That's a good point. That brings up questions of what it means to have a culture. They are implied to be individual rather than social creatures, but have enough social connection to grieve the death of a dragon and retaliate against its killers.

Far less than any of the other races, though, dragons have no sense of cultural history, storytelling or knowledge-keeping traditions, or any of the basic trappings of what we consider to be culture.

Urgals, elves, dwarves, and humans all have distinct societies, art, stories and history, and specific worldviews/religions. Werecats have a king, which implies a social structure, but seem to piggyback on human culture for the most part.

Dragons are said to have a collective inheritable memory, but they have no storytelling or oral history traditions, nothing resembling a village or collective living situation, no arts or crafts or music (Consequence-Thorn's mosaics aside), and nothing resembling a dragon-language or dragon gods.

For all the series is marketed as "dragon books", the dragons really are an afterthought.