A population of the Fu Dog living around a castle. They eat dragons, and it's predator is the toad.
There are two variations of this species. One has fur which prevents them from flying in the rain. The other doesn't have fur so they protect the sky around the castle when it rains.
It rained for so long, water rose over 200 feet high on land. This caused the fu dogs with fur to die out since they couldn't fly away. The fu dogs with no fur flew away to a mountain thousands of miles away from the castle.
The furless fu dogs found a mountain they can live on and eat as much as they want since it was covered with food.