i had a boy with chronic respiratory problems, he had several URIs and eventually pneumonia. he bounced back, but his breathing was never quite the same, dunno if it was scarring or abscesses tho'. vet prescribed oral albuterol to help his breathing, not sure what dosage but it was a teeny tiny amount. in the beginning it seemed to help a bit, but after some months as his lungs worsened it was less and less effective. were warned when he first started taking it that it could make him kind of hyper, speed up the heart, and possibly result in panic attack type behaviour.