A third method of correction is to use your fingertips to apply pressure on top of the muzzle or even use them to close the dog's mouth. (americanshihtzuclub.org)
The forehead of the Irish Wolfhound is slightly raised while the eyes sit on top of the muzzle. (wideopenpets.com)
As you say this, rest his chin in the palm of one hand, so that your fingers curl upward and gently around his lips (not over the top of his muzzle), and place your other hand on his collar. (okcpetsmagazine.com)