|As with everything else in Dog Training attention to detail is important as we have you now understand.|
For the dog the way that you treat him, others would do the same, you define the protocol and acceptable limits.
Muzzles: As much as you may love hearing his begging, this will allow just the whimpering to get through (unless tight) and so shut up his yapping or complaints.
Gags: Something to fill his mouth when Master is not there.
Hoods This can allow him to maintain focus where it is needed
Masks: These can be good for both the Master and the slave. Nothing quite a Ski-Mask to add a little 'terror' to a scene. What normally goes with a black Ski-Mask, usually a knife and a kidnapping.
It also hides some of the intent that the Master has for the slave!