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
Gunnison's prairie dog single male/single female, single male/multiple females, or multiple males/multiple females. Arrangement of the communities or social groups may be linked with the distribution of food resources. The territories inhabited by the Gunnison's prairie dog are defended by social groups, and violent behavior is common toward other animals who are not members. These prairie dogs often feed in feebly defended peripheral sections of territories that belong to other groups, but when members from different groups meet in these common feeding areas, conflicts can arise, with one prairie dog chasing the other back to its territory. All prairie dogs, including the Gunnison's