A cats tail is one of the best ways of telling thier mood. A still, raised tail
means a friendly greeting. A sudden whip of the tail shows a threat of
impending attack. A highly excited cat waves its tail from side to side in
jerky, rapid motions. The top of a tail moving means slight dissatisfaction or
impatience. A relaxed cat allows the tail to hang straight down. A tail held straight out behind them indicates caution.