Style question: use of “we” vs. “i” vs. passive voice in a dissertation

A dissertation is a written thesis, often based on original research, usually required for a higher degree.

In writing a dissertation, it is preferable to use the passive voice instead of "we" or "I". It is more formal and it presents the facts or results of research clearly. The use of the passive voice will help the readers form their own opinion about the dissertation based on how they perceived it while reading it not on how they read your subjective views.

Dogs have been considered man’s best friend for decades! most likely because of their kind and loyal nature. they make splendid companions. their loyalty is beyond compare and after all, a dog is the only thing on earth that loves you more than he loves himself! dogs see us as their friends and leaders, they’ll do anything in their power to ensure your comfort and safety.