for whom the bell tolls

I want to get a bell for Ruby's neck so she'll be forced to stop the carnage. So far, I have endured the "gifts" of 7 mice and 3 birds, with 1 bird saved to flap another day. Michael says I might as well stick a sign on her that says Racoon Food. Apparently if she has a bell, the racoons can track her movements easier, thus making her a likely candidate for something else's wrath while she saves others from her own.
Tough call, but I'm hoping I see her bring down a crow one day. Then she'll really be a killah.