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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
That would worry me too..... Can you tell me if she has a history of a heart murmur? Any recent anesthesia? Can you tell if she is breathing hard?
So, there are two things that your description makes me worry about. The first is possibly would be a heart related cough. Many dog with tracheal collapse can also develop heart failure. With the fever, infection is also a concern... such as pneumonia. Pneumonia can occur with kennel cough. Cancer is also a very distant possibleity.
Xrays will give you a better idea of what is going on and where to go from here. The bigger question is what to do now...
If a dog has a breathing rate of greater than 30breaths per minute at complete rest then there is likely a significant amount of fluid in the lungs... either from heart disease or infection. And I would consider it an emergency. Can you count the breathing rate? Do you have an emergency clinic that you can go to tonight?
I don't like to wait when a dog has labored breathing because their condition can deteriorate rapidly. If you are absolutely unable to take her anywhere tonight then keeping her calm, cool and hydrated is the best thing for tonight. Any exertion can make it works.
That is too high. She needs to go to the er. The fluids won't hurt, but if it is her heart it won't help her. She needs a diuretic to get rid of fluids.