About the adopting black cats around Halloween the local shelter when I asked about this said they had no such policy although in our area there is a great surplus of black cats so they are happy to have anyone adopt them ,but another shelter nearby said they didn't allow near Halloween adoptions or were concerned about it because of people adopting cats for the seasonal holiday fashion not because they want a pet , they also have concerns about people adopting pets around the Christmas holiday as people give them as gifts without thinking about the responsibility.
I like black cats, my cat is black, the dog I had as a child was black, if I lived somewhere I could have a dog too I would get a black one , assuming it and I had a good fit of personality.