Has the Tail Wagging the Dog?

If you say that the tail is wagging the dog, you mean that a small or unimportant part of something is becoming too important and is controlling the whole thing.

What does the phrase the tail wagging the dog mean?

informal. —used to describe a situation in which an important or powerful person, organization, etc., is being controlled by someone or something that is much less important or powerful.

Is tail wagging the dog an idiom?

The tail wagging the dog is an idiom that usually refers to something important or powerful being controlled by something less so.