In the Harry Potter series, Dobby and Kreacher, both house-elves, have a complex relationship. Initially, they have a bad relationship due to their differing opinions of Harry Potter. Kreacher, who initially dislikes Harry, gets into a brawl with Dobby after insulting Harry. Dobby, on the other hand, has a deep respect and love for Harry. Despite their differences, they eventually work together to spy on Draco Malfoy, showing that their relationship evolves over time.