What Happened to Dobby Between Chamber of Secrets & Deathly Hallows?

In Harry Potter and the Chamber of Secrets, why did Dobby bother to warn Harry of the 'danger' at Hogwarts beforehand, even though Harry wasn't a muggle-born. Shouldn't he have warned Hermione

Harry Potter and the Deathly Hallows, Harry Potter Wiki

Harry Potter fans urged to stop leaving socks at Dobby's grave

Harry Potter: What Happened to Dobby After He Was Freed?

What Harry Potter's Dobby Looks Like In Real Life

Harry Potter and the Deathly Hallows: Part 2 (2011) - Plot - IMDb

In the Deathly Hallows, how was Ron able to open the Chamber of Secrets? - Quora

Harry Potter and the Deathly Hallows Summary

Dobby the House Elf (From Harry Potter and the Chamber of Secrets) Song, Melody the Music Box, Harry Potter: Music from the Movies (Music Box Lullaby Versions)

9781781102374-4-Harry Potter and the Chamber of Secrets - Pottermore Publishing

Harry Potter and the Philosopher's Stone Draco Malfoy Dobby the House Elf Harry Potter and the Chamber of Secrets Harry Potter and the Deathly Hallows, Harry Potter, film, album Cover png