Dogs are awesome like that. So sad too.
I wonder how long the dog will ultimately stay there. It's obviously ignoring certain instincts already, if it hasn't left the site for two days. But I wonder if it will let itself perish, or if at the last minute if it will move on and try to find a life after the one it knew with its owner.
Dogs can be like that - after the passing of their owner, they may ignore everything else to stay by their owner after death.
The dog isn't sitting there only because it smells the scent of the owner. A dog knows when the master is actually dead, just like they will often know when the master is seriously ill.
Poor mutt, it was so attached to its master that it will ignore its own health and wellbeing to stay beside the body of its master.
We don't really know exactly why they will sometimes do this, but its basically one of two reasons: either it wants to protect the body, or it doesn't care to do anything else except serve the master and feels no purpose to go on with life without its master.
Regardless, that's the ultimate reward of the man and dog bond. I will always have a dog, and will always give a dog as much as I can because they give so much in return.
One of the most depressing episodes of Futurama.