Answer:
Long and slinky like a trout, never sings till it's guts come out.
You get many of me, but never enough. After the last one, your life soon will snuff. You may have one of me but one day a year, When the last one is gone, your life disappears.
Double my number, I'm less than a score. Half of my number is less than four. Add one to my double when bakers are near. Days of the week are still greater, I fear.
I drive men mad for love of me. Easily beaten, never free.
Sharp and long, flag of the world. What is it?
People take me on walks and I run and have fun. What am I?