YOU SAID:

my horse has got sixteen legs and four hairs

INTO JAPANESE

私の馬は16本の足と4本の毛を持っています

BACK INTO ENGLISH

My horse has 16 legs and 4 hairs

INTO JAPANESE

私の馬には16本の足と4本の毛があります

BACK INTO ENGLISH

My horse has 16 legs and 4 hairs