Phebe Westcott Humphreys, A Natural History for Young People…
“ The many different kinds of Dogs that are spread over the entire surface of the globe, with the Wolves, Jackals and Foxes, and their numerous smaller relatives are all grouped under the family of Canidae, which is derived from the Latin word Canis, meaning a Dog. All the members of this family are digitigrade. Though they walk on their toes, like the members of the Felidae, or Cat family, their claws are neither sharp nor retractile like those of the Cat and they cannot serve either for attack or defence. ”
