Dunning was born in Denver, Colorado. He was the second player to go straight to the Major Leagues after being drafted without spending a day in the minors.
On May 11, 1971, Dunning had the distinction of hitting a grand slam home run off of Oakland Athletics pitcher Diego Seguí. This remained the last grand slam hit by an American League pitcher until Félix Hernández of the Seattle Mariners accomplished the same feat June 23, 2008 in a game against the New York Mets.
He was traded with Bill Melton from the Chicago White Sox to the Angels for Jim Spencer and Morris Nettles on December 11, 1975.

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