When the ground queakes too much to be just one dragon, it might be because you are about to be visited by several of them!
if is the blue dragoness be ware to have enough fish, clams, oisters, whales and sushi!
if is the orange one be sure to have a looooooooooooooot of cheeeses!
and if they both loom on your horizon be sure to have tons and tons of them all!
after all would be bad manners to ask a dragon to shrink down, only them decide what is a proper size for them!
and that also includes when in one bite they can take all your stock, is not their fault for you not having dragon sized portions