Answer:
I jump when I walk and sit when I stand.
What kind of dog keeps the best time?
I am a person who pretends to be someone else
I am slim and tall many find me desirable and appealing they touch me and I give a false good feeling once I shine in splendor but only once and then no more for many I am to die for.
I'm not really more than holes tied to more holes; I'm strong as good steel, though not as stiff as a pole.
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.