What is that thing?

"Dear Cocoa,

I just wanted to send this as a warning to all of your reader's who are thinking of making a trek into the great unknown--I'm talking about the place through the front door!  I ventured there just two days ago (was it really only two days?); anyway, I ventured through and here is my story:

I loved chasing the leaves in the wind and chasing a butterfly till it flew too high for me.  I loved the chance of freedom, going where I wanted without anyone to yell "get off of there".  I loved the games I could play with the tiny rodents that roamed the yard.  I loved the chance to stalk a bug without someone coming by with a tissue to get rid of it before I had had my chance.  And I loved lying in the sun on a sun-warmed surface for hours.  Then it struck!  A creature so ugly that I couldn't help but blanch when it

approached.  Tail already fanned for a fight, the creature raced towards me so fast I didn't have time to fully rise to my feet.  The creatures gray fur blended so well into the hard surface that on occasion I lost the creature for a moment (and I have good eyes).  Then it stood before me teeth furiously working in its anger and tail twitching with pent up anger.  All I could think of was to run, which is exactly what I did.  

The creature, thank goodness, didn't follow, but now I can't get back into my nice safe home because the door is closed!  Please advise me, Cocoa, as I don't like the damp unknown under my nice safe home.

Signed Frightened"

"Dear Frightened,

I believe the creature you encountered in your outdoor trek is called a Quill.  Terrible creatures to be sure; however, they are not the sort to chase the likes of us because we tend to eat their young (well at least those
that remain wild do).  There you have at least a small advantage.  As for the problem of living under the safe home, you must sit before the door you raced out of and yowl with all your heart until one of your pets comes to let you back inside.  Hope this helps,

Signed Cocoa"