Answer:
You will find me with four legs, but no hair. People ride me for hours, but I don't go anywhere without needing to be tugged. Jerked or turned on, I always manage to be ready for work.
No matter how little or how much you use me, you change me every month.
In Paris but not in France, the thinnest of its siblings.
Something wholly unreal, yet seems real to I. Think my friend, tell me where does it lie?
What stays the same size no matter how much they weight?
Be sure to shout for its answers are weak, but there is no language it cannot speak.