Lion

At least once in a lifetime 
Everybody wants to be a lion.

Especially if they're more

A pussycat.

Head of the pack.

Don't want to be preyed upon.

Fast moving, stealthy,

Sharp witted as a tack

And invoking adrenaline for others to run.

But they won't get far.

People enjoy a little fear.

In small doses it may appear 

Useful for some.

To run sometimes means to survive.

But a lion stays and fights.