The fox situation there sounds like the coyote situation here in New Mexico. Resourceful, wiley animals who come into the city for breakfast, lunch and dinner, be it fruit from trees, cats or small dogs, dogfood left outside, etc. and just about anything else edible.
Coyotes can clear a 5-6 foot fence like it wasn’t there to snag the occasional small dog or cat left unattended. I constantly see signs posted on light-poles for “missing pet” with a picture of a Yorkie, Chihuahua, or similar small dogs as well as cats, but the coyotes never seem to return them to their owners.
We do have a few foxes, but the coyotes are the overly dominant predator in and around populated area and keep the fox population down.