We're having problems with a Fox as well, it took our Norfolk Grey Cockeral last night, a Light Sussex Cockeral and a Duck the night before and a Marsh Daisy before them. It looks as if it also had a go at the Silver Dorking but he managed to get away, although he looks a bit ragged. Thank goodness for the 'purple spray' it works wonders.
My sons have acquired a 'Live Trap' but no success so far.
I've googled Foxwatch and they cost around £49 on Amazon, but it sound as if it's worth trying.In the meantime I've found the hair-cutters and my 15 year old son is ready and willing to have a trim. (it's end of term anyway and my Mum always said that the difference between a bad haircut and a good one is 2 weeks!!)