My parents' 18 lb sheltie female is deadly to oppossums. I've lost count how many she has killed over the years.
And my mom swears that the dog wouldn't hurt my chooks. PFT.... riiiiiiight.
A few years ago my parents' cat started her own personal cache of mice in a spare tire in the garage. By the time my folks found the stash, it was a pulsing mass of goo.
Yeah, totally nasty.
Oh, and the chooks would LOVE a dead mouse!! Try it... they'll liiiike it.