Wing began working on-screen at age 9. Her father was an assistant director for Paramount Pictures. In 1931, she became one of the first Goldwyn Girls, and she started her film career in Palmy Days (1932). In 1932, she was seen in Mack Sennett-produced comedies made by Paramount, one starring Bing Crosby. Wing made an impression with producers and moviegoers, but she seldom broke through to leading roles.

Toby Wing played a few leading roles in B features and short subjects. In 1936 and 1937, she worked opposite singer-songwriter Pinky Tomlin in two of his low-budget musical features, With Love and Kisses and Sing While You’re Able. The two stars were engaged briefly during late 1937, with the romance ending before their planned wedding, but they remained close until Tomlin’s death.

Her last leading role was in The Marines Come Thru, although filmed in Florida in 1938, it did not see general release until 1943 as Fight On, Marines! She retired from movies after marrying the pilot Dick Merrill, more than 20 years her senior, on October 19, 1938, in Fredericksburg, Virginia. Wing completed her acting career on Broadway in the unsuccessful 1938 Cole Porter musical You Never Know, which starred Lupe Vélez, Clifton Webb, Libby Holman, and J. Harold Murray.

Wing’s father, a career reserve Army officer, was reactivated for service prior to World War II and was captured by the Japanese in the Philippines in 1942. He survived the Bataan Death March and was later rescued in the Raid at Cabanatuan by U.S. Army Rangers and Filipino guerillas, a story told in The Great Raid (2005). Paul Wing died in May 1957, in a veteran’s hospital in Portsmith, VA, following a coronary.

On February 8, 1960, Wing was honored with a star on the Hollywood Walk of Fame located at 6561 Hollywood Blvd.

The couple retired to DiLido, Florida, where Merrill was assigned Eastern Airlines’ New York-Miami route for the remainder of his career. Wing became successful in real estate in California and Florida. Wing and Merrill later settled in Virginia, where they lived together until Merrill’s death in 1982.

Wing and Merrill married via elopement when she was 22. They had two sons, neither of whom had survived. Their first son died of what was then termed “crib death” and their second son, Ricky, was murdered in their Miami home in September 1982 at age 42. His murder was reportedly related to his involvement in a large-scale marijuana-smuggling operation in New Orleans. At the time of his death, he was free on appeal of a drug-smuggling conviction.