I think I have seen river rats in the steel mills in Pittsburgh bigger than that.
We have hat everyone calls Tree Rats. They live in the trees here. Any neighborhood with large growth trees has them. They chewed their way into our attic last winter. Took our pest guy 3 months to poison them and get rid of them. I think a few I saw were this size. They use our pool fence to travel and will almost walk right by you if you’re outside at dusk.