A Boy and His Dog (1975) movie

The 1975 post-nuclear apocalyptic movie A Boy and His Dog stars a young (obviously) Don Johnson as Vic, a loner wandering the desolated United States of 2024 after World War IV. He's accompanied by his telepathic dog Blood (voiced by Tim McIntire, who also co-wrote the music) who helps him ferret out a woman and food. The movie is based on a novella by acclaimed science fiction writer Harlan Ellison.