FUTURE OF SINGLE BREEDS
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Guard and utility dogs
These dogs will be affected by the degeneration of the dog family least of all. Regular training (even if sometimes not quite suitable at modern training areas), clashes with violent people and criminals (in dogs used for police work etc.) and working (watching buildings and so on) can possibly preserve the natural endowments of these breeds on sufficient level. But only such dogs should breed who are healthy, fed by natural food and used for working purposes – they have skillness and practice with work in the field. There however is a minority of such dogs. Sad to say, a majority of utility dogs’ owners damage their dogs by giving them no suitable work and consequently damage their genetic equipment in this manner. Let us mention the main guard and utility breeds:
Boxer
Boxers are less resistant against colds since they are short-coated, they have a short jaw-bone to grip an offender (when he is well-dressed, for example in the winter) and a rather lower weight. Nor tracking abilities are reported to be very good.
Riesen Schnauzer
Some individuals of this breed are efficient and strong and also good defenders. They stand colds well and when they are brought up well, they are okay.
German Shepherd
It is said that the dog is the descendant of the wolf and therefore the proper dog has to look like a domesticated wolf. And the German Shepherd is precisely such a dog.
Among members of this breed we can find both good dogs and degenerated individuals. Some Alsatians are of weak nature - active at a training ground, timid at real defense of their owner. It is necessary to only breed good defenders with good nature. Only in that case the breed will not degenerate. Excessive training made a half-robot from some individuals that react only to the command of their owner. The individuality is suppressed in this breed. When German Shepherd turns out well, it is good. Unfortunately, hardly anyone succeeds. And when a German Shepherd is very strong, big and sharp, it sometimes has some tendencies to be rather aggressive even towards it's owner.
An example of the German Shepherd Dog that “turned out well”. A strong constitution and good nature. Height 64,5 cm at withers and weight 44,5 kg. This dog belonged to Mr. Jaroslav Piskacek from Plzen and he was called Dux od Bileho vlka CS:

Saarloos and Czechoslovakian Wolfhound are interesting breeds and are a cross between the German Shepherd Dog and the wolf. Natural and fighting instincts are on a higher level then in the German Shepherd Dog, however, natural endowments for classical utility and working training are rather smaller.
There is the Czechoslovakian Wolfhound on the following picture:

Doberman Pinscher
Some individuals are psychically unstable, others in good physical and psychical form. If they are well-bred, they can be successfully used for guarding purposes.
Rottweiler
It belongs among the best and strongest guard and utility dogs together with Riesen Schnauzer. In addition to this, it's coat needs not be much taken care of.
Other Utility Breeds:
Apart from the old and well known there are also other utility breeds like Belgian Sheepdog, very successfully used for police work (there are four kinds: Groenendaal, Laekenois, Malinois and Tervuren) and Beauceron. However, it is possible that other dogs will be used for utility purposes too.
There is less and less game and I do not recommend any further support of hound breeds existence in the interest of Nature's preservation. Some people are hunting by means of hounds either to satisfy their sadistic wants (a legal harm to an animal) or to compensate their complexes of inferiority (a desire to have a skin of a beast or an antler of a beautiful stag on the wall at home and to boast over it). However, hounds are reported to be useful to drive the game out of fields when a mowing of the fields or a harvest. They are also used to find sick or weak animals but if there were natural predators everywhere in Nature they would take care of it instead of hunters and their hunting dogs.
Companion dogs
There is no threat of extinction, only of degeneration. Above all, future human society will want to have good dogs for fondling and for pleasure. But these breeds will degenerate both physically and psychically because they will neither work nor watch. But if these dogs will at least train and sport a bit – a competition of an agility type, for example, they will degenerate less than if they would only be lying at home.
Working dogs (Shepherds, Owtcharkas)
There will be less and less number of these dogs used for real work, even if they are still used for herding and premises protection at some places of this Planet, but less frequently than in their history. And therefore they will also degenerate, but more slowly than companion dogs.
Mastiffs
They worked and fought very much in the past, however, modern time only makes companion dogs from them. That exceedingly damages them and that is why they degenerate. Only such owners will do good to them, who grant a little work and movement to them. The majority of mastiffs owners is however leading their dogs to quick degeneration and to the lost of their original natural endowments.
English Mastiff, the strongest mastiff and at the same time the strongest breed in the world:

Spanish Mastiff (Mastin Espaňol as well), the second strongest dog of the mastiff type and at the same time the second strongest breed in the world:

Sledge dogs
They will not degenerate if they will continue to pull the sledge and will often stay in colds.
Greyhounds
They probably preserve only as dogs used for running races. But their utilization for game hunting will going down, and running after an artificial prey will not do good to them too much.