I saw this covered first in the BBC documentary: The Secret Life of the Dog [1]. If you can find a copy online then it's definitely worth watching; super inter

I saw this covered first in the BBC documentary: The Secret Life of the Dog [1]. If you can find a copy online then it's definitely worth watching; super interesting. [1] http://www.bbc.co.uk/programmes/b00pssgh http://www.bbc.co.uk/programmes/b00pssgh