Prairie dog and Clark in 1804. Lewis described it in more detail in 1806, calling it the "barking squirrel". On average, these stout-bodied rodents will grow to be between long, including the short tail, and weigh between . Sexual dimorphism in body mass in the prairie dog varies 105 to 136% between the sexes. Among the species, black-tailed prairie dogs tend to be the least sexually dimorphic, and white-tailed prairie dogs tend to be the most sexually dimorphic. Sexual dimorphism peaks during weaning, when the females lose weight and the males start eating more, and is at its lowest when the females
Dog type fixes a name to a taxon. Dog fanciers use the term "breed type" in the sense of “qualities (as of bodily contour and carriage) that are felt to indicate excellence in members of a group”. "Breed type" is specific to each dog breed’s written standard. A dog that closely resembles the appearance laid out in the standard is said to be "typey". "Type" also is used to refer to "dogs of a well established line" an identifiable style of dog within the "breed type", usually from a specific kennel. In 2011, a study found that herding dogs were more trainable