An attemept at Terza Rima:

[billy]

1st edit
My Best Friend:

A holstered tale between two nervous knees:
O churlish cur, why bite the hand of care?
the lamb was not for eating if you please.

I call you friend and yet those fangs you bare.
We two, we have a shepherd's job to do,
you're not supposed to be a wolf, just glare.

A year to wait til it becomes a ewe
and then we'll strike, but silent with a blade,
or axe, and have more meat to place in stew.

But no you greedy bastard, had you weighed
the situation up you would have heard
a whistle saying how you should have stayed.

Consider this a punishment deferred
and next time know that you shall be interred.

Original:

My Best Friend:

A holstered tale between two nervous knees:
O churlish cur why bite the hand of care?
the lamb was not for eating if you please.

I call you friend and yet those fangs you bare.
You and me, we have a shepherd's job to do,
you're not supposed to be a wolf, just glare.

A year or so when it becomes a ewe
and then we'll strike, but silent with a blade,
or axe, and have more meat to place in stew.

But no you greedy bastard, had you weighed
the situation up you would have heard
a whistle saying how you should have laid.