Who really is the master? The DOG or the MAN?

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I love my dog. Maybe he is my best friend. But one day, I had a doubt. People say: the dog's master... Hmmm, I'm not so sure! Facts: I wash him, I give him food, water, affection, a worm place to stay, I walk out with him every time he needs/wants that, eaven if out is freezing. Now, my friends, you can tell me if I am the master, or I have a nice and kind master myself?