Bruce was used as a breeding dog for nine years and only ever lived in a backyard shed without bedding or warmth.

Related: Golden Retriever 'Bunny Hopping' Down the Stairs ... But it's Shadow, at just 2 months old, who is now the champion of the world in this category!

A representative for the Colorado-based Morris Animal Foundation's Golden Retriever Lifetime Study — which tracks the health of around 3,000 golden retrievers in the United States — said via ...