As a character in the movie The Thin Man, Asta was the playful pet dog of Nick and Nora Charles, tugging them around town on his walks, hiding from danger, and sniffing out dead corpses. The character later appeared in the sequels After the Thin Man, Another Thin Man, Shadow of the Thin Man, The Thin Man Goes Home, Song of the Thin Man, as well as the 1950s television show The Thin Man. Although Skippy played Asta in the original film, it is believed multiple terriers were used for the sequels, and he wasn't involved in the television show.
Interestingly, the original character of Asta in Dashiell Hammett's book of the The Thin Man was not a Wire-Haired Fox Terrier, but a Schnauzer.
Asta has his own fansite Visit http://www.iloveasta.com/