Quick Answer: Foxes don't eat adult cats but will eat small or cats or kittens. Most adult cats are the same size as a fox and can defend themselves. Smaller cats (less than five pounds) and kittens could be prey for a fox.
Will a kit fox kill a cat?
The short answer is yes and no. In general, foxes keep to themselves as much as possible. They are not known for attacking humans, but they sometimes end up attacking pets like dogs and cats when they feel threatened. However, the documented instances of foxes attacking and eating cats are few and far between.
Are foxes a danger to cats?
Foxes pose little danger to cats. But, like any other dog, foxes will chase cats. Generally, though, when faced with the claws and teeth of a cat, foxes will back away, knowing they will probably suffer a serious injury in any fight. ... But many fox cubs are killed each year by pet cats and dogs.