Who sent Dobby to help Harry? Wasn't Dobby a servant to the Malfoys? - Quora

I'm pretty sure they could have saved Dobby

Harry Potter: How Did Dobby Gain Freedom?

Why wasn't Harry supportive and helpful with S.P.E.W. when he was the one who freed Dobby? - Quora

Why did Harry give Dobby a sock? - Quora

What's the name of the house elf owned by the Malfoy family, that eventually rescues Harry Potter? - Quora

Why has Dobby been portrayed as a slave? - Quora

How did Dobby know about the Chamber of Secrets? - Quora

Why did Dobby help Harry when he was told not to by the Malfoys in the Chamber of Secrets? - Quora

Where did Dobby come from? - Quora

Who freed Dobby from being enslaved by the Malfoys? How did they do it? How long ago was this? - Quora

Funeral of Dobby, Harry Potter Wiki

Why did Dobby try to save Harry throughout the Chamber of Secrets? - Quora

Why did Dobby tell Harry not to go to Hogwarts and then not let him go through the barrier? - Quora