Flash diagnosis

How's Flash? No organ problems, said vet. The panting and wheezing? Some sort of paralysis/constriction of the larynx. It seems to partially block the entrance to her lungs. Only when she gets excited? Or is it always there but when she's trying to pull in more than a resting breath she has trouble? Vet gave Kent antiobiotics (she has an elevated temp) and steroids and said to call back in a few days to let him know if there's been a change. At her size 12 years is the typical age for a dog. She's 13. Other than the panting she doesn't seem geriatric.