Well, i don't replied to your comment as found documentation specifies about this problem. The reference is Joël Dehasse, 1994. Desarrollo sensorial, emocional y social del perro joven (in spanish). publish in The bulletin foro veterinary clinical ethology, vol 2, nº 1-2, pp 6,29, 1994 (Bruselas).
His name in psicology is "pre-puberty sensibility". This problem affect to all breeds, It have a genetic factor so it may affect some breeds more than others and some families more than others.
Before puberty, our dogs are a sensitive period, like puppies over 5 weeks. In this period they can recover old fears or emerge new. We can't prevent this period. Only with early neutering (shown by the experiments) So it means a hormonal source.
Previous work soften the traumas caused at this time. The work of socialization should be repeated during. And most importantly, the sensitivty is temporary, but not the traumas. We must work to eliminate them.
Thanks Vaiva for your opinions.
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