I'm taking a deep breath before posting as I'm new here. I need to address something which arose in responses to the original question.
Foxes and dogs carry a parasite passed on through their poo in contact with grass. It does not make the cow ill, but once in the system she will never be rid of it and can pass it as a lifelong condition to any daughters. The immediate result is that she will abort any calf she is carrying when infected and there is an increased chance of future losses, because it is difficult to detect in the mother. Dogs which are wormed regularly do not have the parasite, though many farmers are now being encouraged to create paths to keep dog poo off the grazing. There have been articles in the farming press and I believe Countryfile have also broadcast about it. Most dog walkers are very careful once they know about this.
So, yes, foxes are a danger to cattle but, speaking for my own small corner of Scotland, I don't know anyone who thinks fox hunting with dogs and horses is a good way of dealing with the problem. It never has been.
As far as the hen house goes, the pine marten is on the increase and a much bigger danger, but as a protected species it can do what it likes ... and recently did, sadly.