He's not a Baby Boy

Joe just got home from work. Here's the conversation as it happened, about 2 minutes ago:

Joe: Hi Baby Boy
Colin: I'm not a baby boy.
J: Hi baby girl
C: I'm not a baby girl EITHER
J: Hi baby mommy
C: I'm not a baby mommy either!!
J: Hi baby triceratops
C: I'm not a baby baby triceratops EITHER!!!!!
J: Then what are you?


C: I'm a dog.