I've a whippet at 21 1/2tts and he's game for anything that pops up in the beam. He's seen everything there is to see when out lamping and wants to go though I only run him on rabbits big and small. If there were no ban then the only way I'd slip him on a fox would be doubled up with a bigger, hardier and more experienced dog. I'm not sure how he would respond to taking a bite...whether he'd back off or get stuck in. As said before...dogs for jobs. While they're game for anything wee dogs, they are at their best and more suited to rabbits imho.