YOU SAID:
the big dog had a pair of dainty gray eyes
INTO JAPANESE
大きな犬は可憐な灰色の目をしていました
BACK INTO ENGLISH
The big dog had pretty gray eyes
INTO JAPANESE
大きな犬はかなり灰色の目をしていました
BACK INTO ENGLISH
The big dog had pretty gray eyes
That didn't even make that much sense in English.