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Hello - I am Dr. Matt - I would be glad to help you with your question.
Did your vet take an x-ray of her chest?
How long has she been coughing?
What did your vet diagnosis Molly with?
Thank you for the additional information.
I am sorry to hear that Molly's cough has been getting worse. This is concerning since she is coughing up fluid at this point. I am concerned that her heart murmur could be related to the cough as congestive heart failure is one of the most common causes of a chronic, congested cough as you are describing. Other possible causes in a maltese would be a collapsing trachea, allergic bronchitis, or a bacterial infection.
I would first recommend talking to your vet about having a chest x-ray taking of Molly as this test alone can help diagnosis the majority of the disorders I mentioned. If she does have evidence of an enlarged heart then your vet can start her on medications such as lasix and pimobendin that can help reduce her cough and help her breathe better very quickly. If her heart looks normal then a different medication can be started such as an antibiotic or even a cough suppressant such as hydrocodone to help her feel better.
Overall, I honestly would have your vet take an x-ray to start.
Hope this helps to answer your question - if not or if you have any more questions please feel free to reply. Thank you for your question.