It is all about purification of the mind. Mind hosts our habits, hence, it is all about purification of our habits.
Everyone can change his habits only if he wants to. There is no human on Earth who can’t do it. It only depends upon how much a potential master want to sacrifice his mind. There is no better drug than own mind. A medical drug will keep under control one part of the brain for some hours or months but it will destroy potentials of many other parts for ever and systematically.
A dog can’t keep human mind under peace either. One day a dog will die and the human mind will get out of mind, again.
But one thing every single man on Earth can do and that is to control himself. Self control is not about good practice to let others to take control over your mind but about your firm decision to change your own habits. It is all about habits of the mind. A mind is a very corruptive and lazy thing.
Silence is, for the beginning, a very good dope against laziness, Not easy at all. It is much harder not to talk than to talk all the time. People are even paying money to shut up. But you don’t have to pay money to be silent or to hide yourself in some cave. You can choose to be silent even then when it seems impossible to be silent. Other minds will spot your silence at once asking you what is wrong with you.
By your habit, you should say: “nothing”. And be silent.