Don't think there's many that open up mate, better off with a beagle spaniel   
 with bushing , surely   a quiet   dog better , as dogs opening up, only pushing game out early , any fox or rabbit wont hang about with lot of noise , they move up and out before you dogs or guns are there. ive seen   lots of birds,rabbits and the odd fox  pushed out with good springers , and deff with  rabbits they seem to hang back more than a fox or birds, springer  quite and does the  job quick/ silent   and gives great sport . another good busher  were border terrier seen few of them on shoot days good little