Behaviorists usually divide a puppy's maturation into four stages.
The day the puppy will leave the breeding facility does not only depend on its physical maturation (end of weaning, autonomy, hygienic conditions), but also on its behavioral development, i.e., its ability to integrate into its new environment.Our aim is not to review all the stages of the puppy's development, all the more so because their chronology is quite different from one breed to the other (small breeds are more precocious), but to insist on the essential part played by the breeder (and his breeding techniques) on the future and quality of his puppies, which will make the reputation of his production. It is indeed easy to avoid many mistakes and disappointments by simply knowing the right periods, when puppies are ready for training or susceptible to aversion.In all cases, it is useful to direct the future owner to a puppy that will meet his or her needs (see Campbell Behavioral Assessments) and to provide socialization advice, which should be reinforced by the veterinarian at the pre-purchase examination. To prevent the dog from becoming too attached to its owner (which often results in serious damage to the home when the dog is left alone), it is wise to keep in mind the natural detachment that spontaneously occurs before puberty if the puppy is left with its mother.