referring to the last part of post the law on ian b bit seem to state you can't dig to the fox until the dog has come out, but you can dig if the dog is trapped i still don't quite get it
Quite simple if the dog does'nt come out after 20-30 minutes of being in the same spot, then for the welfare of the terrier you have to believe he is trapped, meaning you can dig down and retrieve your terrier.