“Like you have seen, in some examples, the horse appears very relaxed, so you wonder if it could be a mental state that results in an unusual autonomic nervous system (which regulates body functions such as heart and respiratory rate, digestion, sexual arousal, etc.) balance associated with penile relaxation or erection.” – Sue M. McDonnell, PhD, a certified applied animal behaviorist and the founding head of the equine behavior program at the University of Pennsylvania’s School of Veterinary Medicine. She is also the author of numerous books and articles about horse behavior and management.
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