Never mind ! Found what I was looking for thanks to user Gingerkid! This is related to my post I made yesterday Canyx was right. I thought that I may get quicker replies if my question wasn't buried in that post. I am trying to train calm following the instructions in Scaredy Dog by Ali...

I've been reading a fair bit on clicker / marker training, and thought I'd try it on some of the shelter dogs where I volunteer. But then it struck me - if I click for one dog - won't the others, within hearing range, expect a reward as well? (Given they were 'conditioned' to react to the same...