Doraemon Nobita and the Animal Planet , Doraemon Nobita to Animal Planet? is a featurelength Doraemon film which premiered on March 10, 1990.
The night, Nobita goes to the bathroom and discovers the mysterious pink gas for the second time. When he enters it, Nobita arrives at a forest. Without thinking, Doraemon takes Nobita when that time has a strong wind. He says that his objective is to meet with the animals. They use the bamboo copter to fly. They finally discovered a little dog at the river with a raft that blown by the wind. Nobita helps it to the city that he told. There many of people waiting for that little dog. Finally, the little dog meets with its father while that finally revealed that the name of that dog was Chippo. Nobita invited for a tea party at Chippos family house. Chippo asked Nobitas house. He told from Tokyo, but Chippo didnt understand. But, Nobita and Doraemon needs to go home. With bamboo copter, they fly back to the pink gas.But, they found something strange. It was a moon that was very big and more bigger than what usually seen from the earth. They finally discovered that this was a different planet. And it only can be accessed from the pink gas. After Doraemon fixes the machine, they go in the pink gas. After that, they realize they are back on earth. In the afternoon, Nobita hears from his friends that they are listening mysterious voices. When he goes back to his home, he founds that the voices are coming from the String less phone. ........
Source: Wikipedia