* A slow and gentle wag: This usually means they're relaxed and content, in a comfortable environment.
* A quick, twitching wag: They might be excited or stimulated.
* A tail held high and fluffy: Confidence, a sense of adventure.
* A tail tucked between the legs: Fear, insecurity, or defensiveness.
* A tail swishing from side to side: They might be in a playful mood.