Gwen,
But how does breeding a dog that is incapable of doing what it is supposed to do prohibit those "jobs"?
Let's look at some standards, descriptions of the "ideal" far a breed, by the AKC:
Rottweiler:
He has an inherent desire to protect home and family, and is an intelligent dog of extreme hardness and adaptability with a strong willingness to work, making him especially suited as a companion, guardian and general all-purpose dog.
Boxer:
Developed to serve as guard, working and companion dog, he combines strength and agility with elegance and style.
These are of paramount importance in the Boxer. Instinctively a "hearing" guard dog, his bearing is alert, dignified and self-assured. With family and friends, his temperament is fundamentally playful, yet patient and stoical with children. Deliberate and wary with strangers, he will exhibit curiosity but, most importantly, fearless courage if threatened. However, he responds promptly to friendly overtures honestly rendered. His intelligence, loyal affection and tractability to discipline make him a highly desirable companion.
Bull Mastiff:
The breed was developed in England by gamekeepers for protection against poachers.
Fearless and confident yet docile. The dog combines the reliability, intelligence, and willingness to please required in a dependable family companion and protector.
Doberman:
Energetic, watchful, determined, alert, fearless, loyal and obedient.
Giant Schnauzer:
Composed, watchful, courageous, easily trained, deeply loyal to family, playful, amiable in repose, and a commanding figure when aroused. The sound, reliable temperament, rugged build, and dense weather-resistant wiry coat make for one of the most useful, powerful, and enduring working breeds.
Komondor:
The working Komondor lives during the greater part of the year in the open, and his coat serves to help him blend in with his flock and to protect him from extremes of weather and beasts of prey.
Nature and Characteristics: The Komondor is a flock guardian, not a herder. Originally developed in Hungary to guard large herds of animals on the open plains, the Komondor was charged with protecting the herd by himself, with no assistance and no commands from his master. The mature, experienced dog tends to stay close to his charges, whether a flock or family; he is unlikely to be drawn away from them in chase, and typically doesn't wander far. While reserved with strangers, the Komondor is demonstrative with those he loves, selflessly devoted to his family and his charges, and will defend them against any attack. The combination of this devotion to all things dear to him and the desire to take responsibility for them produces an excellent guardian of herds or home, vigilant, courageous, and very faithful.
Kuvasz:
Always ready to protect loved ones even to the point of self-sacrifice. Extremely strong instinct to protect children. Polite to accepted strangers, but rather suspicious and very discriminating in making new friends. Unexcelled guard, possessing ability to act on his own initiative at just the right moment without instruction. Bold, courageous and fearless. Untiring ability to work and cover rough terrain for long periods of time.
Beauceron:
He retains a high degree of his ancestral instinct to guard home and master. Although he is reserved with strangers, he is loving and loyal to those he knows.
Black Russian Terrier:
The character and temperament of the Black Russian Terrier is of utmost importance. The Black Russian Terrier is a calm, confident, and courageous dog with a self-assurance which sometimes is rather aloof toward strangers. They are highly intelligent, extremely reliable. They were bred to guard and protect.
German Pinscher:
A working dog, German Pinschers are known for their vermin hunting skills and instinctual desire to protect home and family. The German Pinscher's natural hunting abilities give them a keen sense of prey, drive and determination. The German Pinscher is of strong will and mind and can be manipulative and stubborn when they want their own way. They are territorial and can be quite possessive of their owners and property.
Neopolitan Mastiff:
Over the centuries, breeders of the mastino in the Neapolitan area of southern Italy focused on breeding guards for their homes and estates. They created a breed that retained the giant size, heavy, loose skin and dewlap. This was an animal that was a stay-at-home type, and was good with the family but was bred to detect unwanted intruders and to deter them from the property under their care. Indeed, many say that the Neapolitan Mastiff's unique type was developed purposely as an alarmingly ugly dog, whose looks alone were enough to deter any intruder.
GSD:
The breed has a distinct personality marked by direct and fearless, but not hostile, expression, self-confidence and a certain aloofness that does not lend itself to immediate and indiscriminate friendships. The dog must be approachable, quietly standing its ground and showing confidence and willingness to meet overtures without itself making them. It is poised, but when the occasion demands, eager and alert; both fit and willing to serve in its capacity as companion, watchdog, blind leader, herding dog, or guardian, whichever the circumstances may demand.
Mal:
Correct temperament is essential to the working character of the Belgian Malinois. The breed is confident, exhibiting neither shyness nor aggressiveness in new situations. The dog may be reserved with strangers but is affectionate with his own people. He is naturally protective of his owner's person and property without being overly aggressive.
Groendale:
The Belgian Sheepdog should reflect the qualities of intelligence, courage, alertness and devotion to master. To his inherent aptitude as a guardian of flocks should be added protectiveness of the person and property of his master. He should be watchful, attentive, and always in motion when not under command. In his relationship with humans, he should be observant and vigilant with strangers, but not apprehensive.
Tervuren:
The Belgian Tervuren reflects the qualities of intelligence, courage, alertness and devotion to master. In addition to his inherent ability as a herding dog, he protects his master's person and property without being overtly aggressive. He is watchful, attentive, and usually in motion when not under command.
Bouvier:
He has been used as an ambulance and messenger dog. Modern times find him as a watch and guard dog as well as a family friend, guardian and protector.
Briard:
retains a high degree of his ancestral instinct to guard home and master.
Caanan Dog:
The Canaan Dog is a herding and flock guardian dog native to the Middle East. He is aloof with strangers, inquisitive, loyal and loving with his family.
Puli:
By nature an affectionate, intelligent and home-loving companion, the Puli is sensibly suspicious and therefore an excellent watchdog.
Notice any themes in the description of the "ideal" in these breeds? "Watch dog", "Guardian", "Family Guardian and Protector" all terms to describe the "ideal temperament". How often can this be said of many of these breeds as seen today? In many of the standards the importance of the origional temperament is being removed in the Standards. For instance the Doberman. A breed designed as a compainon/protector, and yet there are only 2 oblique references to that purpose. Maybe that is because in the U.S. those chacteristics are so far lost? What is next, move the breed to the Non-Sporting Group with the Standard Poodle (A former retriever that has completely lost that function in the breed)?
If you can't be a Good Example,then You'll just have to Serve as a Horrible Warning. Catherine Aird.