Ruff Translation
Reads pitch, roughness and spacing
Dog size
No dog handy?
What was heard
Was that right?
It could also mean
How far to trust it
The thresholds come from published bark, growl and whine studies: low, rough, tightly spaced sounds go with threat; high, clear, spaced ones with wanting company or play. Even research software sorting barks by situation is right roughly 40 to 70% of the time, and dogs differ, so treat each reading as a best guess and check ears, tail and posture.