The reason they decided to hold the equestrian events in Hong Kong is because the Hong Kong Jockey Club has lots of experience in taking care of horses. However, part of the complication for these Olympics is getting the horses to Hong Kong. The horses used in these events are really expensive (over a million U.S. dollars) and they are treated like athletes. Horses aren't exactly stupid, so when they are loaded on a plane, they sense danger and need to be calmed down.
Another issue is dehydration. If a horse gets dehydrated during the flight, the long-term effect may be devastating--the horse could get sick or injured, and the rider cannot switch horses easily as they mostly train with just one horse. Most horses have been with their riders a couple of years.
My mom and brother are in Hong Kong right now and they just experienced a typhoon (like a hurricane) on Wednesday, August 6, 2008. All businesses were closed down because of the high winds and rain that came with the typhoon. Hopefully, this will all clear up before the equestrian events are supposed to start on Saturday, Aug. 9th.
Stay tuned, I'll introduce all the other Olympic co-host cities next.