We have hundreds of foxes here in SE London. I was standing on the flat roof outside the kitchen when I saw one chasing a black cat along a narrow fence. I didn't see the end but heard the most blood curdling noises. Nothing I could do as was too far away and it was awful. A young, old or ill cat stands no chance with an aggressive, hungry fox. The foxes here are mostly around in the early ams and evenings, but they are really tame and sleep on the grass during the day too.
I don't know if the introduction of sealed wheelie bins means that they have less to eat and so attack cats?
OH was very annoyed with me as I wouldn't consider any garden flats in case my boys escaped and got killed by a fox. He took my point though when his boss told him that she and her husband had buried their cat in a nearby forest in Kent and gone on the weekend to visit her grave, only to find to their horror that she'd been dug up and eaten. Stretches my AR credentials to the utmost.
Remember if there are foxes in your area and you build a cat run, to make sure they can't dig their way in - just grass and soil and they can.
I do like to see the foxes though in an urban environment, but make sure your cat is safe. Having said all that, there are plenty cats walking around who they don't seem to bother - probably young and fit cats.
