tail wagging

Translations
хвост виляет
The dog’s tail wagging showed its happiness.
Виляние хвоста собаки показывало её счастье.
Definitions
Tail wagging refers to the movement of an animal's tail, typically from side to side, often as a sign of emotion such as excitement, happiness, or agitation. It is most commonly associated with dogs, who wag their tails to communicate with humans and other animals.