Eventually, your horse will have to be transported in a trailer. Teaching your equine companion to load and unload easily will make any trip you two make together a lot safer.
If you have worked with your horse to not fear the trailer by walking him up to it on a regular basis and allowing him to sniff, even taste the trailer. It is usually not a problem to take the training a step further and lead him into the trailer. When he walks in, backs and stops on cue, reward him highly. Even the most spirited of horses enjoy being praised and given treats and will respond in a positive manner to this method of training.
There are three commands your horse should be able to follow: walk, whoa and back. Simply give your horse the command for walk and tap him on the rump if that his been used as his "starter" to get him going and lead him into the trailer. Then when he is in, give him the command for "Whoa". And if he stops on cue, stop and praise him and give him a treat if that is part of your training routine. Then tell him to back into the stall so he can be safely tethered and you will have a successfully trailer-trained horse.
Use these commands on a frequent basis and practice letting your horse go into a trailer on at least a once a week frequency. Horses tend to push training they don't use frequently to the backs of their minds and he might seem as though he was never trailer broke to begin with if you don't practice this technique with your horse and then one day suddenly try to load him on a trailer.
Working with your horse to master loading and unloading on a trailer will make any traveling you need to do with your horse a very pleasurable experience.






