In the UK, words such as 'pack', 'Alpha' 'Dominance' are bandied around all the time, usually by people with poorly trained dogs who have read certain books or watched certain TV programs. There are a lot of confused people out there who are convinced that their dog will take over the world if they do not eat before the dog and walk through doorways first.
Be a fair and consistent leader and your dog will respond well to that - whether it thinks you are 'alpha' or 'pack leader' is speculation and makes no difference IMO.