Your horse should be well rested, well hydrated, and well fed before a big trip. Itâ€s also a good idea to give your horse electrolytes the day before travel. Donâ€t make any big changes in your horse's diet or routine before a big trip, as he could react badly and stop drinking water or eating like normal. Always try to keep things as normal as possible for your horse so both you and your horse can avoid stress during the trip.