A self-controlling dog muzzle apparatus comprising a dog neck harness (1), a mouth-closing muzzle (2), a drive apparatus (3), a positioning apparatus (4), and a controller (5). The mouth-closing muzzle (2) comprises a dog muzzle (6), a muzzle frame (7), a leash (8), a passive gear (9), and a gear base (10). The drive apparatus (3) comprises a motor (11) and an active gear (12). The positioning apparatus (4) comprises a positioning electromagnetic plug (13), a positioning base (14), and a limiting switch (15). The positioning electromagnetic plug (13) and the limiting switch (15) are mounted onto the positioning base (14). The muzzle frame (7) is provided with a positioning hole (16). The controller (5) comprises a proximity switch (17) and a battery (18). When in use, the dog neck harness (1) is mounted onto the neck (19) of a dog when the dog is away from an owner thereof, the controller (5) controls the drive apparatus (3) to drive the mouth-closing muzzle (2) into swaying, thus allowing a meshed muzzle (22) of the dog muzzle (6) to sway to a position at the mouth (23) of the dog and when the dog is about to bite someone, the meshed muzzle (22) isolates the mouth (23) of the dog from the human body to prevent the dog from biting the human body, thus effectively preventing dog bites, and at the same time, the meshed muzzle (22) does not interfere with the dog from opening the mouth thereof.Linvention a pour objet une protection de type muselière à commande automatique comprenant un collier pour chien (1) une protection pour la fermeture (2) de la gueule du chien comprenant une protection pour chien (6), un support de protection (7) sans orifices de positionnement (16), une laisse à rallonge (8), un pignon mené (9) et un support de pignon (10) un dispositif dentraînement (3) comprenant une électrode (11) et un pignon meneur (12) un dispositif de positionnement (4) comprenant un loquet électromagnétique de positionnement (13), un support de positionnement (14) et
