A pet cemetery can be much more than fodder for horror stories and Ramones songs. It can also be a way to dig deep (pardon the pun) into the ways that people live and grieve. Paul Koudounaris’ thoroughly researched book, Faithful Unto Death: Pet Cemeteries, Animal Graves & Eternal Devotion, is an investigation into the bonds between pets and their owners. It begins by explaining that, although people have kept animals close since ancient times, the modern conception of a pet is fairly contemporary. As people left rural areas in the wake of 19th-century industrialization, they brought their animals with them. In these new, smaller quarters, they grew ever more intimate. Faithful Unto Death is as much about how people love their pets as it is about how they mourn them. For a book that’s ostensibly about death, it’s not overly macabre: Passages about grief and Edna Clyne’s famous “Rainbow Bridge” poem are interspersed with images of a dog named Ah Fuk and a tomb for a beagle named Tippy, “the Elvis dog,” who was sung to by The King himself in her puppyhood. With archival photos and illustrations featured alongside Koudounaris’ portraits of headstones and informal altars, Faithful Unto Death will appeal to those interested in cultural rituals and the human-animal bond; what’s more, readers who have lost their own pets will feel acknowledged in their grief.