Source:
http://www.mirror.co.uk/news/weird-news/dog-facts-10-amazing-things-3908754http://www.petsworld.in/blog/10-weird-dog-facts-you-wont-believe-are-true.htmlhttp://www.petmd.com/dog/pet_lover/WW_5unusualdogfactshttp://www.cesar.com/live-the-life/just-for-fun/100-weird-facts-about-dogs.aspx