This particular topic is more suitable for an essay.
Explanation:
Reports in English don't set the point of view from the author: they set facts, truths in an structured way and are more commonly used for academic or scientific purposes.
Essays, on the other hand, are purely the opinion from the writer on a specific subject. In this particular phrase, we have the word MY in <em>my dog</em>, so it's going to state the author's opinion about his on failure.
