Monty wrote PS: No, I don't have a wife.

chortle!

Someone wrote snapping turtle but as they
aren't native you could get raided by the
fish and wildlife folks who don't have a sense
of humor about these things.
Pike? Are they found in the PNW? Same concern
about natives.
Bullfrogs will eat goldfish and small, live squirrels.
They aren't native but are here to stay. If you see very large tadpoles in a
local pond this is probably what they are.
Crayfish will eat dead critters and any old slow goldfish they can get ahold
of.

ka30p - who feeds the squirrel that lives in our
backyard peanuts, walnuts and cranberries ;-)