Question for multiple dog owners

I have been a dog owner and lover all my life. My partner never attached to dogs the same way I have. Ever since Luna came into our lives, my partner absolutely ADORES Luna. Basically Luna now gets treated better than me 😂. My partner now passed a comment that Luna “needs a friend”, and she was serious… My initial thought is I don’t want to mess with a good thing we have going with Luna. Luna is a great dog, loving caring and all the great stuff. My question is, would adding another pup be good or bad as far as them connecting or clashing over their owners attention? Any insight would be great