My daughter is the one who named Dexter. We believe she got it from that cartoon Dexter's Laboratory. He is a great dog! Dex and Lily are total opposites. He's very laid back and listens really well and Lily.........well, she likes to play and bite and chew everything in sight! She's our little 'Lily-Monster' as we call her. We just figure she will calm down some when she gets a bit older.