In what movie did a guy find a robot dog? - briefly
The movie in which a man finds a robot dog is "I, Robot".
In what movie did a guy find a robot dog? - in detail
The movie you're referring to is "A.I. Artificial Intelligence" directed by Steven Spielberg, released in 2001. In this film, the protagonist David (Haley Joel Osment), a child-like android, discovers a robotic dog named ABC (short for Advanced Biomechanical Canine) while exploring an underwater city. The robot dog is a significant artifact from the past, and its discovery plays a pivotal role in David's journey to understand his own existence and purpose. "A.I. Artificial Intelligence" is a thought-provoking exploration of themes such as artificial intelligence, humanity, and love, with the robotic dog serving as a poignant symbol throughout the narrative.