The stimuli for coughing in normal individuals
include airway mucus and the small quantities of material inhaled in the normal
course of eating, drinking and breathing.
Abnormal stimulation of coughing is caused
by excessive airway mucus and other secretions, excessive quantities of foreign
material, noxious irritants such as smoke, airway inflammation and airway compression.
Compression and collapse of the airways
is a common cause of coughing in dogs and is important in tracheal collapse,
pulmonary neoplasia and left-sided cardiac failure with left atrial enlargement.
In such situations a combination of airway collapse and airway inflammation may
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