Dragons make their homes in hills and mountains.
They enjoy eating livestock and if they drink a cow's milk it'll speed up their growth.
They are extremmally poisonous and if they bite you you'll die in seconds.
They have a huge appetite and are always hungry.
They can be killed by a silver blade which has to be stabbed through the heart or head.
Everything about them is dangerous from their poisonous blood to their razor sharp teeth.