Merck Manual

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Heaves, classic presentations
Heaves, classic presentations
Heaves, classic presentations

A series of three horses with classic heaves during crises. Horse 1 exhibits tachypnea, dyspnea, and flared nostrils. Horse 2 has a prolonged expiratory phase of respiration, and a heave line is apparent at end expiration. Horse 3 is undergoing a severe crisis of airway obstruction with tachypnea, expiratory difficulty, abdominal lift, and a heave line.

Courtesy of Dr. Bonnie R. Rush.