A photographer for National Geographic was apparently taken care of by a Leopard Seal for 4 days while photographing the animal. She tried to teach him how to hunt and then apparently began to do it for him. If it's true, I gotta say that is pretty cool.
http://bit.ly/WwpS5B
This one is just like a dog :D
http://www.youtube.com/watch?v=g7rZTZBOrqQ
And that seal was pretty amazing.