Source : Webster's Revised Unabridged Dictionary (1913)

Condog \Con*dog"\ (?; 115), v. i. [A punning corruption of
   concur.]
   To concur; to agree. [Burlesque]

   Note: This word appears in early dictionaries as a synonym
         for the word agree; thus. ``Agree; concurre, cohere,
         condog, condescend.'' --Cockeram.