YOU SAID:

the horse was too fat to fit through that door

INTO JAPANESE

その馬はあまりに太っていたので、そのドアを通ることができなかった

BACK INTO ENGLISH

the horse was too fat to go through the door

INTO JAPANESE

馬は太りすぎてドアを通ることができなかった

BACK INTO ENGLISH

the horse was too fat to walk through the door

INTO JAPANESE

馬は太りすぎてドアを歩くことができなかった

BACK INTO ENGLISH

the horse was too fat to walk through the door