Respiratory medicine is an underdeveloped subspecialty in veterinary medici
ne, and there are relatively few sophisticated tests that are available to
the clinician that actually diagnose specific pulmonary disorders. Instead,
most of the commonly available tests are most helpful if used to point the
veterinarian in the right direction and to rule out the presence of other
potentially confounding disorders. This article reviews the diagnostic test
s that are available to evaluate dogs and cats with signs of respiratory di
sease, including the advantages, disadvantages, and current controversies r
egarding many of the tests used to evaluate animals with signs of pulmonary
impairment.