I have two koolies (an Australian herding breed that is very closely related to Australian shepherds, border collies, and kelpies). I got my older dog during th

I have two koolies (an Australian herding breed that is very closely related to Australian shepherds, border collies, and kelpies). I got my older dog during the lockdowns when I had a lot of free time to train him, and I got my younger dog a couple years later, when I had much less time to train her. The younger one has taught herself almost everything the older one knows, mostly by observing him, but sometimes by him actively trying to teach her. When she doesn't know something, he shows obvious signs of frustration and urging: I give a command, he does the thing I'm asking for, she doesn't react because she doesn't know the command, and then he starts growling and harumphing (and sometimes even air snaps near her face to get her attention) until she follows his lead.