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Syncope (or fainting) is defined as a temporary loss of consciousness that occurs when the brain does not receive enough oxygen. Most dogs who experience syncope spontaneously recover once appropriate levels of oxygen reach the brain.
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The terms 'whistler' and 'roarer' are used to describe horses that make an abnormal respiratory noise during exercise. The noise is heard during inspiration (i.e., breathing in) and may be anything from a high pitched soft whistle to a harsh 'roar'.