Half of wild boar face cull in Forest of Dean amid concern over dog attacks and spooked horses - Telegraph
Frankly a few mutts chasing boar and other wildlife and having the tables turned on them -well so what - might stop then chasing things. As for horses getting spooked aren't riders taught properly over here. Admittadely I was taught to ride horses in Africa, and was taught that horse knows that it is fairly low in the food chain and thus likely to spook at a pice of paper, rustling grass or whatever. Most importantly it's the rider who should nt spook - if you are nervous then the horse will be more so.
Horse will always spook and riders need to manage accordingly. What do they do in Europe where there are many more things running about in the woods???