The Huffington Post -
29 Mar 2014 18:38

From Mother Nature Network's Jaymi Heimbuch: When I adopted my border collie-cattle dog mix, Niner, there was one thing that was immediately apparent: this dog needed daily mental and physical challenges. Incredibly smart, relentlessly energetic, and with an indefatigable drive for work, I needed to come up with ways for him to be happy living in a city. Our daily walks became our time for learning and challenging my dog to try new things. Most dogs don't know how to balance on small objects rig...
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