I had the same error.
pg_dump: server version: 9.1.3; pg_dump version: 9.0.4
I just used the homebrew update function and it updated the north version and pg_dump with the latest version in homebrew (9.3 from 9/19/13).
brew upgrade postgresql
I reworked my dump statement and it worked great.
pg_dump -U postgres development > dump.sql
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