I've seen foxes getting away from good fox dogs but it might happen 1 in a hundred but does happen to the best of them. I'd like to think that man tried the dog again before he came to his conclusion.
I have seen dogs doing this that are not getting enough work and being tried at every hole the owner sees. Try only entering her in occupied earths and up the work load.
Jigsaw I would see knocking the bitch out as a possible disaster the anaesthetic can be very dangerous. I would be very nervous putting a top quality brood bitch out for that operation.
Why the fu#k would you get a black dog for ratting I just can't understand it. O sorry you like the breed, you know nothing about them. Where I come from its a sin to use a black dog for rabbit.
Roadrunner give us a break any decent terriers will go to ground given the chance. What about earths that would be unknown in an area.
Spookz I would suggest you go for a terrier spaniel cross or similar for general mooching.
I had a collar that was about 3 years old and started to act up b&f fixed it free of charge and were a pleasure to deal with I had the collar back in 2 weeks