This is the one part of kpop that I've never understood. I'd have expected them to be there anyway regardless of status, so it seems to me like they've been removed entirely rather than not been popular enough in the list.
I didn't have one, but my neighbour that lived opposite had a dog called Goldie that me and other kids in the street played with all the time. I remember when she passed away my sister posted it on facebook, and those that had since moved were as sad as us. She was an awesome dog.