The reason Teddy is most difficult to raise is four to five months old because Teddy at this period is very energetic and very clingy. In addition, Teddy itself has a relatively high IQ, so it may not be easy to tame it, and it may even Behaviors such as vandalism and home demolition occur; Teddy also needs to take care of its hair when it is four or five months old, otherwise the appearance will not be beautiful, so it will be more difficult to raise and require more time and energy to take care of it.