My two dachshunds also share our bed. We have no dominance problems with them. I think it took my husband awhile to get used to it,( I had the dogs first) but now he wouldnt have it any other way either.

A large breed, on the other hand, I would not allow this even as a pup, since it would be harder to re-train the dog after it got too large. I had my husky/retreiver trained to sleep beside my bed from the day I brought him home, and he was happy there.