A: I want to be a mail carrier when I grow up.B: Why? A: Because you get to meet a lot of people.B: You sure do.A: And you get a lot of exercise every day.B: That’s the truth.A: And you get to play with a lot of dogs.B: Well, you’re supposed to be working.A: Yes, but I will always pet the friendly dogs.B: What about the unfriendly dogs?A: I think if you are friendly to dogs, they are friendly to you.B: Dogs are like people—not all of them are friendly.