This is the 3139th most frequent Korean word.
개나
"개나" can mean "or something like" or "whatever" in a casual context.
The word '개나' is used informally here to mean even for something as ordinary as a dog, emphasizing the universally good quality of the weather.
오늘은 산책하기에 개나 좋을 날씨네요.
Today is such a good day for even a dog to have a walk.
The phrase '개나 소나' is a common Korean idiom meaning 'anyone,' used here to emphasize that there are no entry restrictions.
개나 소나 이 모임에 들어올 수 있어요.
Anyone, even a dog or a cow, can join this meeting.
In this sentence, '개나' is used figuratively to denote simplicity or triviality, implying that such topics are not to be brought up.