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.
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A pig wagging its tail can indicate excitement or happiness, similar to how a dog wags its tail. It can also be a sign of anticipation, especially if the pig is about to receive food or attention.
He liked how you petted him.
It's tail.
A dog is a house pet that wags its tail as a form of communication, usually to express happiness or excitement.
voluntary
On average, a dog wags its tail several times a day. Assuming a dog lives for around 12-15 years, it would wag its tail tens of thousands of times over its lifetime.