Thank you for the quick responses.  

I had taken her to two different vets to determine what the cause was.  She had a small lump growing at the top of her right leg under the skin. It was growing very fast and when i took her to the first vet they took a couple samples of her lump and found out it was a solid mass and had pockets of liquid.  The liquid was an over production of joint fluid.  The samples came back as inconclusive.  Her white blood cells were slightly elevated but the real problem became the liquid pockets of joint fluid in the lump.  Once it was extracted for biopsy it began to leak and become larger.  Within 10 days it had doubled its size and became inflamed.  It was really gnarly and ugly.  They suggested amputation since it was growing so fast and draining it or removing it wouldn't work.  It would just return.  She was miserable. I took her for a second opinion and they also agreed that amputation was the best solution.  We are awaiting a diagnosis from the limb sent off to Michigan State University.  She has a rare condition and both vets had only heard of a few similar cases like hers.  She also was born with backwards knee caps and believe it or not shes doing pretty good post op.

Jerry, your probably right that they wont charge me.  I'm going to call them.  Everything just keeps adding up so quickly.  Thank you for all the responses.  I have been trolling here for a week prior to her surgery.  All the stories on here are so heartwarming.  Thank you so much!