infection or cancer? i'm really worried now.

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For the past eight months or so, my girl has been having this wheezing cough. several visits to the vet all ended with the vet prescribing anti-histamines and steroids for asthma. it helped a little but the wheezing cough never did went away. recently, about a month ago my girl starting having nasal discharges. i brought her to yet another vet who finally believed me about her being down with a flu. xrays were taken and antibiotics prescribed. sadly, she didn't react very well to the antibiotics and continued to have the wheezing cough. the most recent visit to the vet was about a week ago. xrays taken this time showed that the whitish shadows on her lungs are getting much bigger and denser. the vet told me it could be a bad case of lung infection or worst, lung cancer. i'm bringing her in in a week's time to have yet another xray taken. hopefully her lungs will be cleared by the antibiotics she is taking now. i really can't stand the thought of my little girl having lunch cancer.