I have had puppies before, but melly dog died last year, and so this new one will be my first pup in 15 years. A lot seems to have changed, crating? Pack theory? I've not used a crate in the past, should I? I am getting a bitch, and that is a first for me, so is there anything about bitches that I need to know or read up on? She is only a couple of weeks old, we will be getting her in January, so I want to be prepared!