Well after having at least 3 foxes in and out of my garden all morning and the most horrendous noise going on out there, I emailed environmental health at the local council. They are going to send an inspector, but whether they will do anything I don't know. I have been googling foxes and most reports say that they are not a risk to dogs or cats, but only to small animals like rabbits etc. Some people say that they are, but that seems to be personal views, not experts, although there is a report of a chichuahua being killed by one. So I am panicking a little less now, although Dylan was so freaked by the noise that he just does a quick wee and back in again now. I just keep watch when I send him out. I think that maybe the litter of cubs has now grown to the stage where they are getting territorial with each other and that could be why they are so noisy and active at the moment. I am also going to get a repellent - they don't affect dogs as they are about scent and territory. I hope it quietens down again.