<P> Abbey and Kona , both three - year - old German Shepherd dogs , played Neville 's dog Sam . The rest of the supporting cast consists of Salli Richardson as Zoe , Robert 's wife , and Alice Braga as a survivor named Anna . Willow Smith , Will Smith 's daughter , makes her film debut as Marley , Neville 's daughter . Emma Thompson has an uncredited role as Dr. Alice Krippin , who appears on television explaining her vaccine for cancer that mutates into the virus . Singer Mike Patton provided the guttural screams of the infected `` hemocytes '' , and Dash Mihok provided the character animation for the infected `` alpha male '' . Several filler characters with uncredited roles were in old news broadcasts and flashbacks , such as the unnamed President 's voice ( Pat Fraley ) , and the cast of The Today Show . </P>
<P> Abbey and Kona , both three - year - old German Shepherd dogs , played Neville 's dog Sam . The rest of the supporting cast consists of Salli Richardson as Zoe , Robert 's wife , and Alice Braga as a survivor named Anna . Willow Smith , Will Smith 's daughter , makes her film debut as Marley , Neville 's daughter . Emma Thompson has an uncredited role as Dr. Alice Krippin , who appears on television explaining her vaccine for cancer that mutates into the virus . Singer Mike Patton provided the guttural screams of the infected `` hemocytes '' , and Dash Mihok provided the character animation for the infected `` alpha male '' . Several filler characters with uncredited roles were in old news broadcasts and flashbacks , such as the unnamed President 's voice ( Pat Fraley ) , and the cast of The Today Show . </P>
will smith 's dogs name in i am legend
will smith 's dogs name in i am legend
Sam
Sam