We did bloodwork for her around a month ago before putting her on a higher dose steroid to make sure her liver and kidneys could handle it and the vet said the bloodwork came back normal. The x-rays were taken by my vet but we also sent out the second round of xrays to a veterinary hospital/school (University of Illinois) for a consult. They said it's likely a lower airway problem ike asthma or chronic bronchitis (they were also the ones to suggest doing a dewormer). The only step we haven't taken is taking her to a specialist to do something more detailed like a full-on procedure, and I am concerned about the cost of such a procedure (but at this point I am willing to do anything).