Without a previously established context, you should go with, I want my horse. Given the proper context, it could also mean, I love my horse, but you really need to have the context established before you take that tack.
montar
"I want my son."
Quiero can either mean 'I love' or 'I want'. So Quiero mi boda means I love my wedding or I want my wedding.
Quiero ir a caballo. Atleast I think that's how you say it.
Te quiero con todo mi corazon corina = I love you with all my heart corina
"Yo quiero mi amigo" means "I want my friend" in Spanish. It expresses a desire for a specific friend.
"hola mi querido te quiero tu perfil" means hello my dear I love your profile.
I love you, my wonderful boyfriend.
Translation: I love/like you in my....
I want to go to bed with you.
It means: "I want you in my bed."
It means: I love my Carma