He has taught the baby to play "fetch." Late last week he demonstrated her new developmental skill. He'd take a toy, show it to her, toss it across the room and tell her to fetch. AND SHE DID! She'd crawl as fast as her little hands and legs would go, grab the toy, sit down and show it to him, then crawl back with it. They did this over and over. I just about died.
My baby plays fetch and tag. She's a good little dog? :p