I get this question quite often, and I always ask people to clarify why they are concerned that this might be a problem. They usually tell me that they heard from someone else or saw a television show that talks about "putting dogs in their place" or making sure dogs do not become the "alpha" in the house.
Dog Training Blog
Dog training tips by Jeff Millman of Chicago Paws.
There are so many dog training myths perpetuated by old school techniques, bad trainers, or trainers that do not give their clients the benefit of the doubt and "dumb down" everything into simple sound bites.