i had one about 15 years ago , caught fox, (deer with another dog, she was first to make contact) , hare and rabbits, worked with ferrets. she was with me for many seasons and hardly had any time off , i would love to have her back. she was 3/4 bred. i had her second hand after the previous owner had a litter from her . probably the best alrounder i have owned.
if a pup comes from healthy stock and is reared correctly you have as much chance as any with it . collies and greyhounds ,generations of good working stock.