I have one exactly the same . The whole family and me went out with her last evening for a walk, she did her usual thing - chasing every field mouse/ rabbit at sight and then turned into a black and white dot on the horizon as she headed for the horse stables in the distance I shouted and shouted to no avail!! Its in her blood though, hunt, hunt, hunt! I got her back after about 25 mins of searching and she was the happiest dog I've ever seen i'm interested to hear what other people have to say too. Here she is.