Answer:
I am a fruit with seed on the outside.
You use me between your head and your toes the more I work the thinner I grow.
My tail is long my coat is brown I like the country I like the town. I can live in a house or live in a shed And I come out to play when you are in bed.
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
A dagger thrust at my own heart dictates the way I'm swayed. Left I stand and right I yield to the twisting of the blade. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.