I occasionally use a tube of Quietex for trailering a horse, but that lasts only 12 hours. Of course, in those 12 hours it works quite well. However, I would recommend against a calming supplement unless there seems to be no other practical alternative. Some horses, such as odinsown mentioned, do not do well with calming supplements and others can get harmful side effects. Cut down or cut off any grain or sugary treats/feed your horse is getting and try to have small amounts of hay in front of her as often as possible to simulate grazing. Also, talk to your vet about vitamin or mineral supplements that horses that do the same work/live in the same area etc as your horse may need (for example, in WA state there is a Magnesium deficiency so I give my horse a magnesium supplement, a lack of magnesium can make horses seem irritable, nervous, and reduce muscle performance). Let him get plenty of turn out and work on relaxation whenever you are with him, riding or not.
"The trouble with the world is that the stupid are certain and the intelligent are full of doubt"
Last edited by roro; 01-14-2010 at 10:34 PM.