I've known of some very good terriers that were still being dug too after loosing a leg and with ratting the terrier will probably learn to use it's brain to compensate for lack of speed.Out of curiosity, did the vet give the option of putting the terrier down or did they just tell you they were taking the leg off ?
I can't wait for your book to come out. It should hold some wonderful story's Have you thought of what you will maybe call the book Neil ???