In obsolete terms the difference between dag and cag

is that dag is a kind of large pistol while cag is keg.

As nouns the difference between dag and cag

is that dag is a hanging end or shred, in particular a long pointed strip of cloth at the edge of a piece of clothing, or one of a row of decorative strips of cloth that may ornament a tent, booth or fairground while cag is keg.

As a verb dag

is to shear the hindquarters of a sheep in order to remove dags or prevent their formation.

As an interjection dag

is expressing shock, awe or surprise; used as a general intensifier.

As an initialism DAG

is Deputy Attorney General in several nations’ federal governments.