Who is Asta in the motion picture, The Thin Man?

Asta, a wirehaired terrier, is the Charles's pet and undoubtedly the most levelheaded member of the Charles family. Asta is Nick and Nora's constant companion. Although the dog definitely has a nose for sleuthing and enjoys adventure just as much as its family members, it is also a bit cowardly, hiding at the first sign of trouble.