YOU SAID:

I got the horses in the back hair is matte black

INTO JAPANESE

私は後ろの髪に馬がつや消し黒になった

BACK INTO ENGLISH

I got a black horse on my back hair

INTO JAPANESE

背中の毛に黒い馬が乗った

BACK INTO ENGLISH

A black horse got on her back hair

INTO JAPANESE

黒い馬が彼女の背中の毛に乗りました

BACK INTO ENGLISH

Black horse got on her back hair

INTO JAPANESE

黒い馬は彼女の背中の毛に乗りました

BACK INTO ENGLISH

Black horse got on her back hair