YOU SAID:
She was 18 in dog years
INTO JAPANESE
彼女は犬の年で18歳でした
BACK INTO ENGLISH
She was 18 years old in the year of the dog
INTO JAPANESE
彼女は犬の年に18歳でした
BACK INTO ENGLISH
She was 18 years old in the year of the dog
You've done this before, haven't you.