Why is it, that you must only mount a Horese from the left side ?

a horse can be mounted from either side. it just depends on how the horse was trained/how the horse is approached.

mounting from the left started sometime around the time of knights.

they wore their swords on the left, so in order to mount a horse so the sword would not be in the way meant mounting from the left.

it just sort of became traditional after that.

the horse's field of vision comes into play...i believe it can only see one side at a time, so if it has been trained to be mounted from the left, that's where it is looking.

so if a rider mounts from the right, the horse is startled and may bolt.

i got my answer from the site below.

I attempted this on my horse, who remains to be considered 'green', and to start with she used to be like "What the hell are you doing? Eating me?" and she or he moved away the first couple occasions, but then she allowed me to get on, even though she used to be just a little weirded out. Should you bought a horse, and did this continually it might to accept being set up from the correct simply the equal because the left (i wouldn't do that with a horse that's not yours as the owner can be particularly careworn on why there horse is appearing weird). That is customarily a just right thing to do if you are occurring a path and for some motive must mount from the correct part. I don't know why the left side is considered the 'correct' facet. I think since 92% of the population is proper handed, so mounting and main from the left part is what the majority does, and is what feels relaxed to them. I think over the years as most persons like to guide with their right hand seeing that it feels more usual for them, that it can be simply become the norm as they taught more people to do what they do, so eventually every body simply mentioned that was once the way in which it is completed.

Horses are trained to be mounted from the left side. If you try to mount them from the right side they get spooked and will jump or even run.