My 9 year old boston terrier started throwing up a few months ago. We took her to the vet and they said that she looked really healthy - her coat was shiny, her gums and teeth were good and that nothing seemed to be wrong. We took her home and she was fine for a week maybe and she started throwing up again - more frequently. She throws up every thing in her stomach; nothing is left and then she goes and eats more and cannot keep it down. We have switched dog foods and such and nothing is working. Tonight we were watching TV and she threw up the most enourmous pile yet and she looked miserable, We pet her and we could feel every bone in her ribs and stuff. We aren't starving her by any means, she just cannot keep food down for the life of her and it is really becoming a hazard to her health. We are very concerned about her well-being - what do we do? and what do you think might be wrong with her? We are wondering if she has blocked intestines or stomach cancer or something. Please help!