Who does your dog think you are?

I think my dog thinks I am her care provider but not the leader of the pack. My chow responds well to me, she for the most part behaves herself. She does not give me a hard time when I have to give her a bath or groom her. She does not tug on her leash when we go for our walks (except when a cat approaches her) and does not get into any mischief inside the house. When she is in the garden however she does not respond immediately when I call her. My husband on the other hand is her pack leader. He calls her and she comes running. He can even take her on walks without a leash.