Foxes will usually leave adult cats alone. They will grab a kitten if they can.
In general, cats pose a bigger threat to foxes because while a fox will occasionally prey upon a kitten, adult cats will enter an unguarded den and simply kill every kit in there without eating one of them. (Cats are the only animals that think about killing twenty-four hours a day.)
If adult cats are vanishing, then it's coyotes or feral dogs
Foxes will usually leave adult cats alone. They will grab a kitten if they can.
In general, cats pose a bigger threat to foxes because while a fox will occasionally prey upon a kitten, adult cats will enter an unguarded den and simply kill every kit in there without eating one of them. (Cats are the only animals that think about killing twenty-four hours a day.)