Living with a pet is related to a host of socioemotional health benefits for children, yet few studies have examined the mechanisms that drive the relations between pet ownership and positive socioemotional outcomes. The current study examined one of the ways that pets may change the environment through which children learn and whether childhood pet ownership might promote empathy and prosocial behavior through parent-child conversations about emotions and mental states in the presence of a pet dog. Participants included 123 parent (118 mothers, four fathers) and child (65 female, 58 male, M[subscript age] = 39.50 months, 75 White, not Hispanic, nine Asian/Pacific Islander, seven Hispanic, five Black/African American, two South Asian/Indian, two American Indian/Alaska Native, two "other," 21 more than one race, 111 residing in the United States) dyads currently living with a pet dog (n = 61) or having never lived with a pet dog (n = 62). As hypothesized, we found that parents used a greater proportion of emotion and mental state language with their children when playing with their pet dog than with a lifelike toy, suggesting that the presence of a household pet may be one context used to promote conversations about emotions and mental states.