German Shepherds are not necessarily any different than other dogs when it comes to training. If your dog does not know simple commands, such as sit and heel, then start with those. It is important to begin training by building trust between you and your dog. Keep training sessions happy and short and give the dog a break in between lessons for play and a drink. Food is a powerful motivator for most dogs. Other dogs, particularly those with a high prey drive, respond well to toys as a reward. Either way, praise, in addition to a reward that is valuable to your dog, is used to communicate to your dog that they have performed well.  The timing of the reward is extremely important. Your praise and reward will need to come within two to three seconds of the behavior you are reinforcing. If the dog does something else in between the desired behavior and the reward, you are rewarding the last thing that the dog performed. For instance, if you want to teach the “sit” command, the praise and treat should be delivered when the dog is sitting with all feet on the ground. If you deliver the praise/treat with one paw up or as the dog starts getting up, you have just rewarded the dog for that most recent behavior.  Treats should be small and tasty. Consider three types: Low, medium and high value treats. Keep these in your arsenal to help your dog learn commands. When they first learn a new command, you may need medium or high value to treats to start them off and treat for every success. As they understand the command more, start adding in lower value treats intermittently. You can always go back to high value treats at any time you want to let the dog know they did something exceptionally great and you want them to remember that so you get that behavior again and again. Gradually, you will phase out any treat and do more praise reward as the dog gets more consistent. You don’t want to create a dog that will only work for food and ignore you the rest of the time. That could become a dangerous situation. Clicker training...

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Write a summary of the previous text in Vietnamese:
Bắt đầu với mệnh lệnh huấn luyện chó căn bản. Sử dụng thức ăn, lời khen, và đồ chơi để khuyến khích. Cân nhắc huấn luyện bằng công tắc. Huấn luyện mỗi buổi kéo dài tối đa 20 phút không giải lao.