The most important misconception of dog owners is: "The pet cannot remember and follow the training commands because it is stubborn, stupid and does not see the owner as authority." Let's get rid of it.
In terms of intellectual ranking, dogs are very similar to humans in the sense that some animals can easily and naturally master the commands "fetch", "give a paw", "sit", while others will have to listen to the owner's instructions for a long time and persistently. The main reason for misunderstanding is the lack of communication between the dog and its owner at the proper level.
Dog handlers recommend rewarding their animals for correctly executed commands. Why? Let's remember Pavlov's method - the dog will simply have a conditioned reflex. But the owners should be patient with their favorites. The learning process always requires the full commitment of the teacher.
There is another way to "reach out" to your pet. The owner should accept the canine point of view and think about how to explain the desired action to the pet as clearly as possible.
There is a possibility that the dog may have difficulty training due to physical ailments. In case of joint problems, the animal will be extremely unpleasant to take a sitting position at the appropriate command.
Professional trainers (not dog handlers) recommend breaking down the training process in stages, into simple steps. With this approach, even the most "lazy, stubborn, unloving owner" dog will begin to correctly execute commands.