Soon, Nobita wanted some adventure, and asked Doraemon for that. After Nobita and Doraemon cleaned the dog, they named him Peko. To repay the dog's help, she agrees to keep the dog as a pet. But when Nobita's mom lost her purse, the dog helped her in finding her purse. The dog tried to follow him, but Nobita chased the dog away, fearing his mother will scold him because of her dislike of pets.
When his mom sent him to bring some things from the market, he had gone there, and while he returned, he spotted the dog again, and Nobita gave him a sausage that he had brought from the market.
Nobita wanted to help it, but he couldn't. On his way, he found a dog, dirty and hungry, after fighting with a dog the previous night. While his teacher had allowed him to go, Nobita rushed to his house, fearing that his mother would scold him. One day, Nobita has stuck in the school again, his teacher not letting him to go (He hadn't completed his homework).
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