A highly recruited multi sport athlete out of Pittsburg High School in Northern California, Fenenbock chose to play football at UCLA. He starred as UCLA's single wing tailback in 1938 and 1939. He was celebrated for his exiting breakaway runs as well as for his passing skills. On January 1, 1939 Fenenbock was named MVP in the inaugural Pineapple Bowl played in Honolulu. Following the 1938 season he was named to several All American teams. At UCLA Fenenbock played alongside such greats as Kenny Washington, Jackie Robinson, Woody Strode and Burr Baldwin.
Fenenbock starred for the NFL Detroit Lions in 1943 and 1945. As the Lions single wing tailback Fenenbock finished near the top of NFL statistics in a number of categories. He was named to several All Pro lists. During the 1943 season Fenenbock played a big part in turning around Detroit's NFL franchise. In 1944 Fenenbock starred for the acclaimed El Toro Marine Corps football team In 1945 he returned from military to lead the Detroit Lions to an excellent season.
Los Angeles Dons
In 1946 and 1947 Fenenbock played for the Los Angeles Dons in the newly formed All America Football Conference. Led the AAFC in yards per carry in 1946 averaging a stunning 13.5 yards per carry and was second in yards per carry in 1947. Fenenbock was the AAFC's top kick and punt returner 1946-1948. With the Dons he played halfback in the new T-formation adopted by professional football. Fenenbock was acclaimed, along with Buddy Young, as the AAFC's top speedster and breakaway runner. Famed Cleveland Browns coach Paul Brown called Fenenbock the player he most feared in the AAFC.
Chicago Rockets
In 1948 Fenenbock was traded to the Chicago Rockets in the AAFC. That year, he led the Rockets in most offensive categories. Fenenbock was the Rockets best player and had a spectacular game in his return to his hometown of Los Angeles to play the Dons.
Canadian Football League
With the merger of the AAFC with the NFL in 1949 many AAFC stars jumped to the Canadian Football League. In 1949 Fenenbock started with the Edmonton Eskimos. Fenenbock played his last season in 1950 with the Calgary Stampeders.
Other details
His small stature, powerful build, and blazing speed meant Fenenbock would always carry the nickname Mighty Mouse. In 2000 Fenenbock's son, Michael, published a book about him. Fireworks Every Time He Touches The Ball: A Chronicle of Chuck Fenenbock's Football Career. Maxfilms Publishing 2000.
Later career
Following his playing days, Fenenbock became a successful coach. Most notably at:
