Fergie said:
My current dog, a Springer/Lab mix knows that my wife and I are the Alphas. We have cage trained her since day one, and have established our dominance. She knows that she can play and nip at me, but not with my wife.
I had my dog apartment and leash trained before my wife and I were married. I moved my new bride into a little house with a fenced back yard, so that the dog would not be constantly under foot. The dog knew without being told that my wife was alpha female. No problems at all. The wife is dog tollerant anyway.
When my wife became pregnant with our first child the dog knew it. She would follow my wife (her now pregnant alpha female) around the house 24 hours a day. It drove my wife crazy. Everytime she'd turn around, there was the dog. The dog knew that my wife was alpha female, knew that she was pregnant and wanted to be the "aunt." In a canine pack, the aunts are one or two pack females (usually a sibling or daughter) who help the alpha female when she is pregnant or den bound with pups. They may babysit while she hunts or they will regurgitate meat for her if she stays at the den. In return, they get her protection and a place beside her at the kill.
We brought or first boy home from the hospital at 2:00pm, 52 hours after birth. I had the camera running when the proud momma came in the door with her new baby boy, and there was the dog, going apeshit: whining and licking my wife's feet. When she sat down with the baby the dog was right there, whining and whining. Not jumping up. Not doing anything that might harm the baby or draw an attack from the mother, but whinning and trying to reach up to lick the baby. The taping took a break until about 4 or 5pm. There's the dog again, still whining and simpering. Another break: 8:00pm, and the dog is still there. And she was still there at 11:00pm. She slept next to or followed momma and the baby around continuously (except for food, toilet and security patrols) for weeks.
After that baby had fallen on her, pulled her ears, tried to ride her and eaten her food for five years, she wasn't nearly as impressed when the second baby came along. When we got him home, the dog came over, took one sniff and said, oh crap - another one.