Lumps on our pups are awful. Mine have been through many and everyone I find is like seeing a Mack truck heading right for you. Does it move or does it seem attached? Has Gracie been spayed and is it near a nipple? I could relate all the tales in the world, but you are the one with Gracie in your lap and your heart in your throat. We will have fingers and paws crossed for you tomorrow and have bunches of prayers and positive thoughts headed your way.