Cowhig was selected by the Cleveland Rams in the sixth round, with the 48th overall pick, of the 1945 NFL draft.[4] He was also selected by the Cleveland Browns in the second round, with the 16th overall pick, of the 1947 AAFC draft.[1] He signed with the previously renamed Los Angeles Rams on June 21, 1947.[5] He played in eight games, starting four, for the Rams during his rookie year in 1947, recording 25 rushes for 104 yards, one interception, two fumbles, one fumble recovery, and two kick returns for 29 yards.[4] Cowhig became a free agent after the 1947 season and re-signed with the Rams on July 12, 1948.[5] He appeared in all 12 games, starting three, during the 1948 season, totaling 46 carries for 206 yards and two touchdowns, three catches for 18 yards, and one interception.[4] He played in 11 games, starting one, for the Rams in 1949, accumulating ten rushing attempts for 32 and one touchdown, four interceptions that he returned for 62 yards and a touchdown, and two kick returns for 20 yards.[4] He also played in one playoff game that year.[4]
On June 2, 1950, Cowhig, Bob Shaw, and Tom Keane were traded to the Chicago Cardinals for Bob Reinhard.[5][6] Cowhig appeared in all 12 games for the Cardinals in 1950 but did not record any statistics. He became a free agent after the season.[5]
He signed with the Philadelphia Eagles in 1951.[5] He played in 11 games, starting nine, for the Eagles in 1951, returning three fumbles for 25 yards and one touchdown.[4] He became a free agent after the season.[5]
Cowhig appeared in the 1949 film Easy Living as a football player.[8] On August 19, 1959, he crashed his car into a "concrete light standard" and was treated at Hollywood Receiving Hospital for a "possible fractured left hand and minor head injuries".[9] The car was demolished.[9]