Doraemon: Nobita and the Haunts of Evil (1982)

'I want to explore the unknown land', Takeshi said. Nobita and Doraemon explore the jungles of Africa by Doraemon's satellite. Then, upstream of the Congo River, in the forest where is covered by clouds called "heavy smoker's forest", they discover a huge stone statue has the head of a dog. Nobita and his friends make an expedition with the mysterious stray dog "Peko".