My bitch Corgi is death on rats. What I don't "get" is how she differentiates between rats and other rodents. We have yard sited bird feeders, and squirrels, chipmunks and rats all help themselves to the wastage on the ground. We turn Rosie loose, and she bee-lines for the rat, ignoring the others.
When I was in high school, my sister had a cat that could take down a full grown squirrel, and did on more than one occasion. Still, I've never known of another one.
Generally, so I've read, cats hunt the juvenile rats, a good in itself, but not the full grown ones. Generally predators do not care to be hurt themselves in hunting, so there is a certain size differential they maintain.
Read a short, insightful book called Why Big, Fierce Animals Are Rare, I forget whom it is by.
Rats have a different smell than any of the other rodents. Good for your Corgi!
‘Face
;o]
Squirrels are rats with furry tails and better PR.