Happiness?

I was contemplating a lot of things over the last month.  I have been trying to get to what it  is that makes me happy.  Is it my family? Yes.  Is it  the people I get to spend time with each day? Yes.  Is it the places I get to go and the things I get to see? Yes.

Then I think, why am I not happy every moment of everyday.  What is it that creeps into my head and takes my focus away from these things that make me happy?  I am not sure what it is.  I am going through scenario after scenario in my head wondering and thinking why I can't be at a constant state of happiness.  Is it maybe unachievable?  Is a human not able to remain in a state of happiness?  I look at my dogs, they seem to always be happy.  If they can be happy all the time then why not me.

Are the transmitters in my head not firing correctly or do I need to not be happy sometimes in order to understand happiness.  I know that sounds weird but maybe that is the way it has to be.  But until I can figure it out I am going to have the goal of complete happiness.  I just hope it is something I can achieve someday.