I picked up this book and it's becoming a favorite. You can buy one used on Amazon for a reasonable price. A large family of girls find a dragon in the forest and bring her home to hide in the tower, except she grows so big they can't get her out. She is getting large because she is pregnant and has 12 babies - enough for all the girls to carry one back to the forest.
So cute, the little girls carrying their dragons. Sorry for the poor pictures.