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Just something to mull over that happened in my clinic a few weeks ago. We had a trouble breathing dog come in. He died. We sent off lung tissue to two different labs. One came back negative for valley fever, the other tested positive. It's ways possible that tissue or blood samples that collected and sent in, may not contain yet infected areas, therefore bring back potential false negative results. Hence, medicine is not 100%, never will be. You get the best diagnosis you can, treat and see what happens. You guy by a combo of clinical signs and what is seen diagnostically (x-rays, bloodwork, cytology, etc) and treat the best you know how and can
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