Felix

Felix gets to be in the index

From Peg Boyle Single's story of her thesis and later book writing career, a tribute to her dog Felix:

He had taken to snoring recently and the sound kept me company through final readings of my book, checking style sheets, and triple-checking Chicago Style formatting. I even took on the torturous task of self-indexing so that I could make sure that references to my four-legged writing partner made it into my book, something most
professional indexers would have rightly skipped.