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.
"Yo quiero mi amigo" means "I want my friend" in Spanish. It expresses a desire for a specific friend.
Te quiero con todo mi corazon corina = I love you with all my heart corina
"hola mi querido te quiero tu perfil" means hello my dear I love your profile.
I want to go to bed with you.
"i love my beautiful wife"
Translation: I love/like you in my....
It means: "I want you in my bed."
It means: I love my Carma