There may be laws that say whether bulls can be in areas with footpaths, and whether they're with cows or whatever, but like a great many laws there's no-one to enforce them. In some of the remote parts of Wales I've walked in, no farmer is going to keep his bull off a prime bit of grass just on the slender chance one person like me might pass by, once in a blue moon. Personally, I keep well clear of ANY cattle, whatever sex they are; they are much bigger than me and I simply don't trust them. I either go round by the adjoining fields or, where there are no fences or hedgerows, I make a very big detour, downwind of them if possible.