What do horses do when their in love?

Answer 1

this is the process by which a stallion checks that the mare is ready for covering (checking that she is in oestrus). if she stands and lets him contine the ritual than she is ready. but if she isn't ready she will turn on the stallion and could do some serioous damage.

Answer 2

Horses don't "fall in love." That's a purely human characteristic that doesn't apply to any animal, including horses. As such, the question has no merit, unless you're referring to mating and breeding.