It is very important to prevent aggression problems as early as possible, since it can hamper your training program.
Thus, you should make sure that the moment your dog or puppy sets foot into your house, necessary things should be done to make him happy, secure, and contented.
By doing this, it would make him easier to train, aside from preventing behavioral problems.
Do not get a dog if your family is not at the same page as you are
If you are getting a pet dog, make sure that your whole family agrees with your decision.
Aside from that, they should also share the same passion as you have for your pet. This is because, your family would also be interacting with your dog on a daily basis.
Thus, they can all affect his behavior and development, which are some of the factors that determine the success of your training program.