canon 1d mark 3

This is another shot of Maestro.

I’m not much of a portrait photographer, I don’t know what to say or how to act. People always get scared when they have something like a 1D pointed at them and they literally fidget and start acting weird the second they hear the military shutter going off. Of course I try to put silent mode on to help relax and then I just chit chat to help them relax but do you guys have any tips to make it easier for both the subject and the photographer?