To update this old thread a bit. Today as I was walking my dog through another woodland I saw what I thought were a couple of roe running straight towards us on the path. They only veered off a couple of feet away from my bemused hound and then I realised the front one was a small roe doe being chased by a fox! I think the roe was a small one born last year, so about 14 months, and the fox didn't seem much smaller - about the size of a Labrador.