I've booked a vet appointment today, but I'm worried. The last time this happened we lost our dog some years ago. It's very hard to touch, I saw it when she turned her belly over for a rub. Its in the middle but just north of the nipples on eihter side. Still in the area that wold be soft normally below ribs. My son is off school with anxiety and I don't know whether to take him, or make sure he says goodbye. I'm really worried.