YOU SAID:

my cat weighs twenty pounds she is a chunky girl

INTO JAPANESE

私の猫は20ポンドの重さ彼女は分厚い女の子です

BACK INTO ENGLISH

My weighs 20 pounds and she's a thick girl

INTO JAPANESE

私の体重は20ポンドで、彼女は太い女の子です

BACK INTO ENGLISH

My weight is 20 pounds and she is a fat girl.

INTO JAPANESE

私の体重は20ポンドで、彼女は太った女の子です。

BACK INTO ENGLISH

My weight is 20 pounds and she is a fat girl.