did the vet say what is causing the pulmonary edema? Usually congestive heart failure causes the problem, unless the dog has experienced some sort of trauma to the chest (auto accident, etc.). The dog will not get enough oxygen while fluid fills the thoracic cavity and draining the fluid helps temporarily, but I would want to know what caused the problem to begin with and how surgery is going to resolve the problem. good luck, I hope everything works out.
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