In recent years, much research has been conducted on persuasion techniques using robots. However, little research has been conducted on persuasion through the behavior and emotional expressions of pet-like robots. Therefore, in this study, we examined the expressions used by a pet-like robot to persuade people. Six types of emotional expressions were created by combining each part of a dog's face and tail, voice, and speed of movement. We also selected several behaviors from the preliminary study and created 12 types of animations combining the behaviors and emotional expressions. In the experiment, we asked subjects to evaluate the animations. The experimental results showed that emotional expressions such as "sad" and "troubled" were effective when the pet-like robot was used to encourage the subjects to throw away the trash. On the other hand, emotional expressions that gave the impression of "happy" or "angry" were not effective. In addition, there was little difference in evaluation based on the combination of behaviors.