Germanshepherdsmum
I can only say that I have seen instances of fields over which there are several public rights of way.
Yes there are, however these tend to be arable and farmers will remove ancient hedging to make huge areas that are more economical for large farm machinery. Not always the case, of course, but fields for stock tend to be smaller using the existing hedging or stone walls (depending on the area). One of my local farmers has three fields, all about 6/7 acres. Two of them have a footpath running parallel to each other but because he can open interconnecting gates, you never quite know where his cattle are. However, he uses these fields mainly for store cattle and if he has young bullocks, he puts them in the field without a footpath, not because they are aggressive but because they can be very curious and over friendly. I avoid the cattle (although store cattle are generally fine) if I know they are there but it's not always possible to see them, then dog goes on a short lead at my side away from the cattle and we keep our distance. However, I'm always ready to drop the lead if I need to, cows with calves though are a different matter altogether!