First time aggressions
The first scene, proper of younger, is the crazy races, with emission or not of a constant barking. Before this attitude, the owner may think. My dog is dumb. I am reprehending him and he wants to play. Error! The dog, is simply saying: I don't want to!.
In exemplars of more advanced age or of an intrinsically more dominant character, his way of acting is completely opposite to the former.
The non acceptance of dominance by the dog can be exteriorize with a light snarl that will serve to let him show his incisive, trying to intimidate us. But if necessary, and not to loose his hierarchic position or a determine privilege, he could even bite you.
The punishment that would imply physical contact, will be applied without touching his head or areas around it, so much as to avoid possible injuries to the animal as to reduce the possibilities of being bitten.
After the first contact, the dog may act in two ways: to accept the authority and, how, in consequence, a body frame of submission more or less complete, or to increase the intensity of aggressiveness as an answer to the non acceptance of the authority.
Before this last attitude, you must correspond in the same measure, taking all kind of precautions, until you get the dog to adopt, or is force to do it, a ventral position. Then, we hold him by the lips, shaking lightly his head from side to side and repeating continuously the order no! Until he shows his tongue inside his jaws. Even if he shows submission after the first time you try this, we should always get him to do this last posture.
In any case, it is convenient to clarify that it has to be the person object of the aggression who applied the punishment. If not, it wouldn't have any sense and the problem wouldn't be solved. Before the possibility of accepting thechallenge and not winning it, it is preferable to escape from a situation that you know will provoke an aggressive reaction from the animal. This won't solve the problem, but it won't either make it more serious.
We will avoid that the dog wins the challenge and, what is more important, that he presents this attitude with more frequency. Also, if the animal understands that acting this way, he is going ti win, he will tend to generalize and will present the same attitude towards any type of situations. Or what is worst, before other members of the family who until then where absent from this kind of problem with the dog.
The evasive behavior that a dog could present, usually has its origin in a plainly justified cause for him: cause or provoked motive, conscious or unconscious, for his owners. Between the usual causes of unchaining of this behavior we should emphasize on the following: insufficient exercise related to the factors of breed/age, scarce contact with other and punishment when arriving.