At the same time notice the eyeball itself. Auscultation is listening. A stethoscope is a instrument which amplifies sound and directs them to the listener's ear. Auscultate the horse's windpipe on the underside of its neck. Normal sounds are blowing sounds heard as the horse both breaths in and out.
Abnormal sounds are louder and harsher.
The heartbeat of the horse is best heard on the left side and just above or above and in front of the elbow. A third and fourth sound may be heard. The heart rate and the pulse rate are the same in normal horses. Lung sounds may not be heard at all in normal horses in good body condition. Abnormal sounds may include crackles, whistling sounds and bubbling sounds.