Doraemon: Nobita's Dog and Cat: Space and Time

One day, Nobita rescued and adopted a dog that was almost drowning, and named it "Ah Yi". One day, Nobita, Doraemon and Shizuka used any door to escape to the back mountain in order to prevent their mother from knowing that Nobita had adopted a dog. They found a large number of abandoned cats and dogs in the back mountain, so together with Fat Tiger and Xiaofu, they took many wild cats and dogs and took a time machine back to the earth 300 million years ago before any living things existed to establish a kingdom of cats and dogs. Nobita used the "Evolutionary Degradation Radiation Gun" to evolve Hajime into a human being so that he could understand human speech. That evening, when Nobita was about to return to the 21st century, he promised Hajime that he would definitely come back tomorrow. When he went into the time machine, he accidentally dropped the ball of the wooden ball and was picked up by Hajime. The next day, Nobita and others encountered a time distortion on their way back to 300 million years ago. They were then taken to a thousand years after 300 million years ago, where it turned out to be an international city of cats and dogs. Nobita discovered that the evolution-degenerated radioactive gun was left behind 300 million years ago, which led to the current international situation. Here, Nobita meets Xiaoba, a dog that looks like Hachi. Xiaoba and his friends confide to everyone that it turns out that Xiaoba and others’ parents went to Cat Jerala Paradise but their whereabouts disappeared. Everyone decided to go to Cat Jerilla Park to investigate.