Kinda like how you can tell if a pasture has horses in it instead of cows or when you know your near a barn? There's just that smell that makes me close my eyes and think back to when I was a little girl and practically idolizing the women behind my grandparents house. They had horses so of course I had to be their friends!
I used to wake up and run straight to the window every morning just to see if they were there.
It all comes from that smell. What would you call that smell? That feeling you get that makes you feel at home, happy, lighthearted. Maybe its the essence of a horse?