The Indian Ashvamedha involves the following:
the sacrifice is connected with the elevation or inauguration of a member of the warrior caste
the ceremony took place in springtime
the horse sacrificed was a grey or white stallion
the stallion selected was one which excelled at the right side of the chariot
it was bathed in water wherein a sacrificed dog had been deposited
it was sacrificed alongside a hornless ram and a he-goat
the queen underwent "mock-coupling" with the stallion
the stallion was dissected and its portions awarded to various deities
Basically, What happens is once a year is they find a horse that is grey or white. the king takes it to the middle of a courtyard and then put a bag over its head. They then stabbed the dog next to it. Yes, Not the horse, there was a dog that the queen was holding. They let the horse go out through the main gates and whatever the horse touched became there land. This happened for a whole year and then they took it back to the courtyard, Killed it. Then the queen had love with the dead corpse
Refrence:http://en.wikipedia.org/wiki/Horse_sacrifice
I was told this in history, and then got the wiki afterwards