I love this song. I think its a celebration to the ending of a sad and unproductive time in one' life. The woman hid from tried to find happiness in men, alcohol, and avoiding risks. She found true happiness when she stopped hiding and it "hit her like a bullet to the head" or "a train on a track". I like the contrast between "dog days" and the "horses". Horses are faster and stronger than dogs which illustrates the unproductuve time and the progressing happy time approaching. When she says "Run fast", I think that means "Live your life to the fullest". Live it to for your mother, father, sister, and brother. I also like the video as strange as it may be. It is a celebration of a fulfulling point in life.