Doraemon DVD: Shin Nobita no Daimakyo ~Peko to 5-nin no Tankentai~ (movie)

Nobita finds a lost white dog whom he names Peko while his friends desire an adventure somewhere that still hasn´t been explored during their Summer vacation. After some research the five friends and the dog end up going deep into an African jungle just to find out that Peko has a mysterious connection with their destination.