Sled dog breeder James Roberts puts his younger sled dogs to the test to see which are his strongest - and weakest - and to determine which to sell and which to breed. | For more, visit dsc.discovery.com/tv-shows/yukon-men/videos/#mkcpgn=ytdsc1 Subscribe to Discovery! | www.youtube.com/subscription_center?add_user=discoverynetworks Watch full episodes! | play.google.com/store/tv/show/Yukon_Men?id=DzUoot1uCRM Join us on Facebook: www.facebook.com/Discovery Follow on Twitter: twitter.com/Discovery

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