Check on how bird brains, especially of corvids are more efficient per space then most other animals and that is why they don't need big brains to be smart. Id say Dragons works the same :D
I love smart intellectual dragons too! :D My quad friend group Dieter, Ryuu, Florian, and Lenny all have PhDs but in their dragon versions it’s translated to being very knowledgable about different topics, Dieter: ice magic, Ryuu: history, Florian: plants, Lennox: controlling metal magic.
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https://www.calacademy.org/explore-science/brain-size-for-the-birds