Creatures of habit.
For example, I found out sometime last year that my dogs all do a specific action after the final few taps of the spoon on the last bowl of food. ( I always feed them in the same order and in the exact place every time.)
One does a jump/spin around, one stretches, another jumps up on his hind legs, two of them run over to where I usually place their bowls and sit down and the last one cocks her head to the side.
It's hilarious, but they do it every time.
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