Due to their impact on biodiversity, human health, and livestock husbandry, we need to eradicate feral dogs. However, eradication usually encounters public opposition, which hinders its implementation and success. Persuasive messages could help us attain public support for feral dog eradication. We evaluated the effectiveness of two message frames to increase intentions to support eradication of feral dogs via lethal methods. Messages addressed the negative impacts of feral dogs on (1) human health and livestock husbandry (anthropocentric frame) and (2) wildlife (ecocentric frame). These frames were randomly assigned to 506 Chilean citizens and Chilean residents in a before-after survey experiment measuring attitudes, subjective norm, and behavioral intentions to support feral dog eradication via lethal methods. Both frames significantly increased behavioral intentions, attitude, and subjective norm, irrespective of participant demographics. Changes in attitude and subjective norm influenced change in intentions. Both frames can aid managers increase public support to eradicate feral dogs.