Mary Allen
#7 In relation to his master, the boxer shows the most tender feelings and by all means, shows that he really likes being around.
#8 A boxer retains his childlike activity and spontaneity until the age of 2-3, although physically he matures by one and a half years.
#9 It takes time for the dog to assimilate and consolidate new information.
It seems that having been taught to no avail for a long time, one fine moment begins to do everything that, it would seem, was taught to no avail for a long time.