Belly Up
Belly Up with a Heeler has two definetly different Meanings. One of Trust and the other is Fear.
How to Tell the Difference:
Happy/Inviting: Floppy, loose body, relaxed mouth (maybe panting), soft eyes, tail wagging.
Fearful/Uncomfortable: Tense muscles, tail tucked, closed mouth, stiff posture, averted eyes, or even submissive urination.
I welcome more interaction and discussions on this subject.