[Pet 1] snaps, seemingly out of nowhere, and mauls [Character 2] in a flurry of [snarl/hiss]ing and [teeth/claws].
[Pet 1] is a Dog
Realizing what [he/she] did, the Dog flees and never returns.
[Character 2] -2 Health (Lethal)
[Pet 1] is a Cat
The Cat doesn't seem guilty about this murder. In fact, [he/she] seems very pleased with [him/her]self.
[Character 2] is Killed
[Pet 1] +4 Morale