Dogs will often risk their lives for us, so nice an owner do it in return.

I don't think happiness is directly proportional to expectations. I think happiness lays within the journey to where you place your reality. I say "your" reality because two people can live side by side and perceive the world differently. Each would then define their realities differently, perhaps one is happy and the other isn't.

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Expectations are very arbitrary and dynamic so I won't even go there.