Doraemon: New Nobita's Great Demon - Peko and the Exploration Party of Five (2014)

Plot

Nobita stumbles upon a stray dog and brings him home, unaware that this pup is a young prince from a hidden realm in Africa's Smokers Forest, where dogs have developed their own civilization. Teaming up with his friends, Nobita embarks on an adventurous quest to return the prince to his kingdom. However, upon their arrival, they discover that everything has transformed, presenting unexpected challenges and revelations about the prince's homeland. This journey tests their friendship and courage as they navigate a world that has evolved far beyond their expectations.