The success of your dog in such an exercise, as apportirovka, will depend on its natural abilities and characteristics of its breed.
For a hunting dog, for example, apportirovka is an exciting game in which it is engaged almost instinctively, while the German shepherd will be at a loss in the beginning and only after long exercises will understand what they want from it.
In general, all dog breeds are divided into two main categories: those who like to play and those who do not like it. First you need to teach the dog to grab a fitting object, drawing attention to it in various ways, throwing it forward, bringing it to the dog's nose and removing it again, rolling it on the ground, and so on. In the process of this game, let the dog command "Aport!" whenever the subject is in her mouth. If the dog starts to grab the object with visible pleasure, the goal of the game is achieved.
It now remains to teach her to rush for the subject only at your command, holding her by the collar, if she tries to rush ahead ahead of time. When the dog grabs the object, command it to sit in front of you. She already knows this command. And then with the command "Give!" make the wear out of your teeth. To get her to this team, stroke her, then say - "Give!" and bring your hand to her face, as if inviting the dog to open its mouth. Do not require the dog to completely give it to you.
Trying to pull him out of the mouth, you can make her feel owner, and she will squeeze her teeth even tighter. If she does not want to give it to you, show her the second item that you should have with you and let her know that as soon as she gives up the old item, the game will start with a new one. If the dog does not know how or does not like to play, the exercise will be more difficult. In this case, you can try to rub the item with meat, so that the dog has an incentive to grab it, if not for pleasure, then at least out of greed.
As soon as the dog grabs the object, call it, command - "Give!" and hand her a real piece of meat in return, letting her know that a well-executed exercise entails a specific reward. Teaching a dog to fit, especially if it is not prone to this kind of exercise, can take a lot of time. Therefore, it is necessary to be patient and methodically to continue classes, in any case, do not stop half way.
If you notice that your dog responds positively to a stimulus that is not provided for in the training manual, calmly use it, developing your own method. It is important that the dog reportable items with pleasure. If it will bore her or associate with something unpleasant, your work will go down the drain, since it is impossible to force a dog to aportize an object if it does not want it.