If Foxes are all they have to worry about they should be glad. Here in Colorado I've seen Foxes (large grey ones) and Coyotes running down the town streets at night. Some areas get Mountain Lions also. Kitties don't last long here if they're left outside at night.
Heck, here in Michigan we have coyote problems.
The place i just moved out of was sheep country, and the coyotes were so bold...
they'd come right up to the house...
I've also seen racoons. They apparently live in the sewers, because I've seen them coming in and out of the storm drain.