Answer:
Soft hairy from door to door. I am the pet that always stays on the floor.
A necessity to some a treasure to many I'm best enjoyed among pleasant company. Some like me hot some like me cold. Some prefer mild some like me bold.
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
What is it that after you take away the whole some still remains?
I run up and down the stairs without moving. 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.