A dome inhaler system is provided. The dome inhaler system includes a transparent dome with an opening designed to be placed over a pet's head to facilitate the pet's breathing of medicine dispensed within the dome. The system also includes an inhaler flange designed to mate an inhaler with the dome's opening to dispense a dose of medicine (preferably aerosolized) into the dome. Once the medicine is dispensed into the dome, the inhaler flange may be removed, and the dome may be placed over the head of a pet for the pet to freely breathe in the medicine. The system also allows for the metered or continuous introduction of therapeutic gasses and other concentrated atmospheres to the subject while the subject's head is within the dome. The dome may then be easily removed by lifting it off of the pet's head.