1. Dogs wag their tails when they are pleased. 狗一高兴就摇尾巴。
2. Now I growl when I'm pleased, and wag my tail when I'm angry. 现在我高兴时就咆哮,生气时就摇尾巴。
3. Dogs, for example, will wag their tails, get down their front legs, and stick their behinds in the air to indicate "what follows is just for play". 例如,狗会摇尾巴,放下前腿,把屁股翘在空中,表示“以下的动作只是为了好玩”。