Technically, it is a very contagious illness that is characterized by a distinct cough, that is caused from inflammation in the upper respiratory system of dogs. (all-about-goldens.com)
Considering their very sensitive respiratory system, we need to be cautious about what goes into the air around our birds. (petbusiness.com)
Similar to that of humans, canine respiratory system includes the mouth, nose, throat, and lungs. (practical-pet-care.com)