Can anyone explain the meaning of the lyrics of the song "Dog days are over"..?

... by Florence + The Machine. I tried but these lyrics are too deep for me to understand. So need help with that! TY :) ""Happiness, hit her like a train on a track Coming towards her, stuck still no turning back She hid around corners and she hid under beds She killed it with kisses and from... show more ... by Florence + The Machine.
I tried but these lyrics are too deep for me to understand. So need help with that! TY :)

""Happiness, hit her like a train on a track
Coming towards her, stuck still no turning back
She hid around corners and she hid under beds
She killed it with kisses and from it she fled
With every bubble she sank with a drink
And washed it away, down the kitchen sink

The dog days are over
The dog days are done
The horses are coming
So you better run

Run fast for your mother and fast for your father
Run for your children for your sisters and brothers
Leave all your love and your longing behind you
Can't carry it with you if you want to survive

The dog days are over
The dog days are done
Can you hear the horses
'Cause here they come

And I never wanted anything from you
Except everything you had
And what was left after that too. oh.

Happiness hit her like a bullet in the back
Struck from a great height
By someone who should know better than that

The dog days are over
The dog days are gone
Can you hear the horses
'Cause here they come

Run fast for your mother and fast for your father
Run for your children for your sisters and brothers
Leave all your love and your longing behind you
Can't carry it with you if you want to survive

The dog days are over
The dog days are gone
Can you hear the horses
'Cause here they come

The dog days are over
The dog days are gone
The horses are coming
So you better run

The dog days are over
The dog days are gone
The horses are coming
So you better run""
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