Puppies - our son adores his Daddy and they have lots and lots of fun together, but there are times where he just wants Mummy too. I think he needs "down" time from Daddy, as when they play together it's always full on and full of energy and excitement. When we play, it's much quieter and more relaxed. I think they need that balance. My DS is Mummy's boy, but I expect as he grows, he'll be Daddy's boy too. Don't worry, your little man is going to love you more than anything.