Varmints

This short film starts off by a dog like creature living happily on a grassland where it's  full of nature. However, a group of other creature comes to destroy the environment by creating towers and tall buildings. The dog tries to save the nature and took off a branch and ran away home. He tries to take care of it, but the environment gets worse and worse. Then one night, the tree branch started to create bubbles and it eventually turns out to be a jellyfish. Everyone escapes into the jellyfish, so they won't  get sick.