YOU SAID:
My Donkey is very fat
INTO JAPANESE
私のロバは非常に脂肪
BACK INTO ENGLISH
My mare is very fat
INTO JAPANESE
私の馬は非常に脂肪
BACK INTO ENGLISH
My horse is very fat
INTO JAPANESE
私の馬は非常に脂肪
BACK INTO ENGLISH
My horse is very fat
That didn't even make that much sense in English.