i would say a good big dogfox can make it difficult and be a handfull, but for me the vixens with fire in there belly are more common than dogs with the same attitude. just going on what ive seen, and i dont do as many now but doubt its changed that much in the last ten years, as for lurchers with the mindset of a terrier. try the litter wastage from a first cross . with a bit of bulk and learn some fieldcraft.