Abstract: A nebulizer delivery device for administering a nebulized drug to an animal having a means for connecting the device to a drug source, a reservoir for holding the nebulized drug in communication with the connecting means, at least one air inlet valve and at least one inhalation one-way valve for delivering the drug to the animal, central chamber also in communication with the reservoir and at least one exhalation one-way valve, and a mask for receiving the nebulized drug and for fitting over a breathing portion of the animal. A nebulizer system and method of administering a nebulized drug to an animal via the system are also described and claimed.