Help save Bella. She wants to live.

Bella is a 12-year-old black lab. Found her behind the truck stop when she was 6 weeks old. She's the happiest sweetest nicest dog in the world. She loves everyone she meets and loves Alpo and bones. She has a new baby sister 5 months old. Bella's been through everything with me the past 12 years my father's death my mother's two strokes good friends bad friends. She's the most loyal dog I've ever had and my best friend. She was recently diagnosed with a mass on her mouth as you can see in the pictures and it's getting worse day by day. She also has a mass on one of her mammry glands that has to be removed. The veterinarian clinic - Cordova veterinary clinic here in Memphis Tennessee, veterinarian Angie zinkas has said that it would cost minimum 3500 for the surgery. at this time I simply do not have the money to pay for this. I considered selling my car that I have to have transportation. Bella is physically in great shape and runs and plays and rolls in the grass and it's amazing how strong she is at 12 she can still pull me like a horse with the leash. Bella wants to live and we feel that if she has the surgery she can live anither happy four or five years because if her great physical shape and happy demeanor. The windows pretty short here so if you can help me thank you in advance.