An attemept at Terza Rima:

[tectak]

1st edit
My Best Friend:

A holstered tale between two nervous knees:every dog has its day and dogs with short tails have weak-ends
O churlish cur, why bite the hand of care?
the lamb was not for eating if you please.comma after eating makes sense

I call you friend and yet those fangs you bare.another wordplay of merit on bares/bears
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 weighedcomma after no. Full stop after bastard...or just leave it alone
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:
I LOVE IT MORE AND MORE!
Best,
tectak
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.