I think you don't know that horse was not found naturally in Sub-continent; IVC which ended 1900 B.C. and left behind a lot of information of its resident and flora and fauna; horse is missing, nowhere to be found on seals (except a desperate attempt to forge a horse seal was made by some desperate persons ), toys, tablets etc.
Aryans introduced the horse in sub-continent.
LOL. The cave paintings proves you wrong, doesn't it ?
Not only was horses well known as mentioned in the purans which are dated older than IVC , the rock paintings prove they were domesticated and used for transport.
It just proves what rubbish the whole AIT was.