It means they are content or happy.
A dog is a house pet that wags its tail as a form of communication, usually to express happiness or excitement.
It is accepted that a Happy cat purrs like a happy dog wags his tail.
A dog wags its tail and the tail wags the dog.
No
It's tail.
Its a metaphor that means something is controlling your life other than your brain. Ordinarily, a dog will wag HIS tail when he is happy, hang it low when he is sad or in trouble or hold it high when he is confident. Figuritively speaking, if the tail is wagging the dog then it is controlling him..not the other way around.
voluntary
When a dog wags its tail in a circle, it typically indicates excitement or happiness. This behavior is a sign that the dog is feeling positive emotions and is likely in a playful or friendly mood.
it wags its tail and barks
There are no statistics as to the number of times a dog wags it's tail in a lifetime. Different breeds wag their tail either a little or a lot. It also depends on the longevity of the dog.
A story about the part of a dog that wags is often referred to as a "tail" tale. This playful pun combines the word "tail," which is the part of the dog that wags, with "tale," meaning a story. Such narratives can highlight themes of loyalty, joy, and companionship associated with dogs.
"The dog wags the tail, but the tail don't wag the dog." -Arthur Ashe 1989