The message
from "Christina Websell" contains these
words:

Seeing a poisoned rat not yet dead and in distress stopped me from using
poison forever. I had to kill it.
There will be terrier men in your area longing to exercise their dogs on
your rats.
Tina

But whatever you do do NOT use poison when there are dogs about. Our
neighbour's dog got some and was very ill for a month or more, and the
vet's bill was astronomic!