When your non- horsey family asks you to please not talk at dinner because you only talk about horses.
Haha this happens to me and my cousin all the time. Especially since my cousin is a vet and she tells me stories and experiences she's had with horses and other animals. Haha my family especially doesn't like that when it's a family dinner.
You find yourself tasting horse treats to see what there like and find yourself eating certain horse treats cause they actually taste good. Yep I'm guilty of that!
Trucks windows are covered in horse stickers, wear all horse related shirts, talk about horses almost non-stop. Have a wall filled with Breyer Horses and a room filled with horse related Items. Buy movies simply cause there's horses in them, on an on. Yep I'm a horse guy... No strike that a certified horse NUT!!
I walk to work, and there have been countless times that I've thrown on my barn boots by mistake when I'm in a hurry to get out the door. They sit in my cubicle all day and while I think it smells cozy and welcoming, my co-workers (politely) disagree.
When all you can talk about is Junior this and Junior that and how you think he's cute and how he has a nice butt and how he smells so good and how he lets you kiss him and how you love to hold him... And when your friends want to know when you've started dating, you say, "I'm still single. Junior's my horse."
Or when you have to read a story or book in class about horses and you find it pointless because you've read EVERY horse book out there. Twice.