What would happen if animals took over humans?

In the book Animal Farm the animals do all the work, and the humans get all of their eggs, milk and their newborn. The animals get together in a barn and figure out a plan to stop the humans and take over them. The boar named, Old Major gets all the other farm animals together and talk bad about the humans. He later teaches them the song "Beasts of England", and they all sing the song and Mr. Jones their drunk farmer hears them. He grabs his gun and takes a shot out at the barn. The shot scares all the animals and they scatter. If animals took over humans and controlled them it would be chaos. The world would change dramatically. I'm not sure what would happen for sure if animals took over the world. I think we would still live our everyday lives but the things we do to animals would change, and the foods we eat would be different because there would be no meat. Our obesity problem may be different due to the food.