i have a bassett/dachshund mix.. i woke up this morning and was petting her and i found a small lump on her right back upper leg. it's about the size of a nickel and it's hard. im taking her to the vet next week to check it out, but im really stressing out over this. she's getting kinda old, she's 7, and the most important thing in the world to me. if anybody knows anything about this could you please help me?