The first dog I had (beagle x terrier x heinz 57) when I was 10 was a b*****d for running off every cat,squirrel, even bloody birds in flight hed be gone over even our tallest fence 6ft + and if I was lucky id find him, but mostly a day or so later hed turn up miles away covered in shite. Many a sleepless night worrying if id see the bugger again