Subject, a 2-year-old Chesapeake Bay retriever, spent much time in a room with floor-to-ceiling bookcases. He was observed to withdraw one of the older volumes present (Barrington, Sir John. Sketches of his own time. 1880. Chicago: Belford, Clarke & Co.) and gnaw the spine.
We hypothesize that nineteenth-century bindings contain animal-based glues, thus attracting the bibliophage. Further research is required. Correlative counter-surfing behavior also appears to be related.