Catfight!!!!

With unsheathed nails and open maw,
Tooth by tooth and claw by claw,
that truce unbroken for so long
suddenly shifts from right to wrong.
Familial peace disturbed for now,
they execute their noisy row.
No metaphor that fur will fly
before they reach their usual tie
and go to curl up in the sun,
their sibling spat for each unwon!

For Fandango’s prompt: Altercation