#1
Just minutes ago I saw a video of a Dog diving deep underwater, pulling out a rock and while coming back up, releasing his breath, I am so amazed that a Dog learned the concept of holding breadth underwater and equalization of mind.

Read the comments and saw many claims that some dogs have this instinct by birth, although not seen one trained to do that.

What do you guys think? I have always admired how dogs are trained to do mind blowing things but holding its breadth to dive underwater is something new to me, because the pressure itself on the lung and the body is very different then out in the land/atmosphere.