“I have found that a certain stamp of show-bred Fox Terrier takes a lot of beating for work when properly entered, but he must have the make and shape of the short-legged hunter. When dog show people call a show terrier a working sort of terrier, they are apt to include terriers that I, at any rate, would not pick out for a Huntsman's Terrier; but if a show terrier conforms in build to that of the short-legged hunter, and some of them do, then one is getting along on the right lines.
It is not my object in this chapter to crack up any particular breed above any other breed of terrier, but i have mentioned the Fox Terrier, and when I say Fox Terrier, I mean show-bred Fox Terriers with the necessary working points, simply because they possess, and are bred for, so many of the good working points that are required in a working terrier. […]
Many huntsmen and private individuals who work their terriers have their own particular strain of terrier which can trace back for several generations of good working blood. These terriers are bred almost entirely because their parents are working terriers. Other points are not generally taken into consideration at all, except perhaps the keeping down of size.
The result is that many of these terriers are nondescript, and many of them have certain points of their build which are a handicap to them when they are at work, though their pluck and working sense are good. Great admirer as I am of the pluck and work of these terriers, I cannot help feeling that they could be vastly improved, and given a conformation more suitable for work, if only they were bred to terriers such as I have previously described, either by mating a working bitch to a show Fox Terrier dog, or vice versa, but the show terriers used must be of the long, low sort built like a short-legged hunter. This is very important.
It must always be remembered that the good working points of show Fox Terriers, such as sloping shoulders, legs and feet, etc., are not just due to chance, but have been bred for for many generations, and this fact will make it more than likely that these points will be reproduced again. To breed certain working points into working terriers that will improve their conformation, and prevent them being handicapped at work by faulty build, we must go to blood where these points have already been stamped for generations, so that they will be reproduced.” - Major G. B. Ollivant, in Chapter Two of ‘Terriers: Their Training, Working, and Management’
This is such a fascinating opinion to have, especially compared to other writers of this era (early 1930s), and especially with a modern perspective on the conformation of show bred Fox Terriers as they stand today. But I think there is a lot of merit in this thinking, when you consider the original purpose of dog shows was to compare working bloodlines.