1. Remember that the animals you select for breeding today will have an impact on the breed for many years to come. Keep that thought firmly in mind when you choose breeding stock.
2. You can choose only two individuals per generation. Choose only the best, because you will have to wait for another generation to improve what you start with. Breed only if you expect the progeny to be better than both parents.

3. You cannot expect statistical predictions to hold true in a small number of animals (as in one litter of puppies). Statistics only apply to large populations.

4. A pedigree is a tool to help you learn the good and bad attributes that your dog is likely to exhibit or reproduce. A pedigree is only as good as the dog it represents.

5. Breed for a total dog, not just one or two characteristics. Don't follow fads in your breed, because they are usually meant to emphasize one or two features of the dog at the expense of the soundness and function of the whole.

6. Quality does not mean quantity. Quality is produced by careful study, having a good mental picture of what you are trying to achieve, having patience to wait until the right breeding stock is available and to evaluate what you have already produced, and above all, having a breeding plan that is at least three generations ahead of the breeding you do today.

7. Remember that skeletal defects are the most difficult to change.

8. Don't bother with a good dog that cannot produce well. Enjoy him (or her) for the beauty that he represents but don't use him in a breeding program.

9. Use out-crosses very sparingly. For each desirable characteristic you acquire, you will get many bad traits that you will have to eliminate in succeeding generations.

10. Inbreeding is a valuable tool, being the fastest method to set good characteristics and type. It brings to light hidden traits that need to be eliminated from the breed.

11. Breeding does not "create" anything. What you get is what was there to begin with. It may have been hidden for many generations, but it was there.

12. Discard the old cliché about the littermate of that great producer being just as good to breed to. Littermates seldom have the same genetic make-up.

13. Be honest with yourself. There are no perfect dogs (or bitches) nor are there perfect producers. You cannot do a competent job of breeding if you cannot recognize the faults and virtues of the dogs you plan to breed.

14. Hereditary traits are inherited equally from both parents. Do not expect to solve all of your problems in one generation.

15. If the worst puppy in your last litter is no better than the worst puppy in your first litter, you are not making progress. Your last litter should be your last litter.

16. If the best puppy in your last litter is no better than the best puppy in your first litter, you are not making progress. Your last litter should be your last litter.

17. Do not choose a breeding animal by either the best or the worst that he (or she) has produced. Evaluate the total get by the attributes of the majority.

18. Keep in mind that quality is a combination of soundness and function. It is not merely the lack of faults, but the positive presence of virtues. It is the whole dog that counts.

19. Don't allow personal feelings to influence your choice of breeding stock. The right dog for your breeding program is the right dog, whoever owns it. Don't ever decry a good dog; they are too rare and wonderful to be demeaned by pettiness.

20. Don't be satisfied with anything but the best. The second best is never good enough.

Excellent!

A good friend once told me that developing a good breeding program is kind of like making a stew - it's very easy to add things to it, but once there, impossible to remove.

A good way to look at it when deciding whether to incorporate a dog or bitch into your breeding program...

This is the version I found more often quoted from Mr. Oppenheimer:

1. Don't make use of indiscriminate outcrosses. A judicious outcross can be of great value; an injudicious one can produce an aggregation of every imaginable fault of the breed.

2. Don't line breed just for the sake of line breeding. Line breeding with complimentary types can bring great rewards; with unsuitable one, it will lead to immediate disaster.

3. Don't take advice from people who have always been unsuccessful breeders. If their opiinions were worth having, they would have proved it by their successes.

4. Don't believe the popular cliche about the brother or sister of the great champion being just as good to breed from. For every one that is, hundreds are not. It all depends on the animal conceerned.

5. Don't credit your dogs with virtues they don't possess. Self-deceit is a stepping stone to failure.

6. Don't breed from mediocrities. The absence of a fault does not in any way signify the presence of its corresponding virtue.

7. Don't try to line bred to two dogs at the same time; you will end by line breeding to neither.

8. Don't assess the worth of a stud dog by his inferior progeny. All stud dogs sire rubbish at times. What matters is how good their best efforts are.

9. Don't allow personal feelings to influence your choice of a stud dog. The right dog for your bitch is the right dog, whoever owns it.

10. Don't allow admiration of a stud dog to blind you to his faults. If you do, you will soon be the victim of autointoxication.

11. Don't mate together animals which share the same fault. You are asking for trouble if you do.

12, Don't forget that it is the whole dog that counts. If you forget one virtue while searching for another, you will pay for it.

13. Don't searh for the perfect do as a mate for your bich. The perfect dog for every bitch does not exist -- never has, never will.

14. Don't be frightened of breeding from animals that have obvious faults, so long as they have compensating virtures. A lack of virtues bis by far the greatest fault of all.

15. Don't mate together non-complementary types. An ability to recognize type at a glance is a breeder's greatest gift. Ask the successful breeders to explain this subject --- there's no other way of learning. (I'd define non-complimentary types as ones which have the same faults and lack the same virtures).

16. Don't forget the necessity to preserve head quality. It will vanish like a dream if you do.

17. Don't forget that substance plus quality should be one of your aims. A fool can breed one without the other.

18. Don't foret that a great head plus soundness should be one of your aims. Some people can never breed either.

19. Don't ever try to decry a great terrier. A thing of beauty is not only a joy forever, but a great terrier should be a source of aesthetic pride and pleasure to all true lovers of the breed.

20. Don't be satisfied with anything but the best. The second best is never good enough.

Either version (or both) should be printed and put on our kennel walls so that we can remind ourselves daily of some of the more important points.

I agree whole heartedly. In addition, I would think that these premises are what we should be thinking about and talking about here on this forum - would be much more productive.