The heart is the strongest and hardest working muscle in a body. Its constant beating gives us life. It endures years of 24/7 labor and fluctuates with our activity. It is also, metaphorically, the most fragile part of all of us, sensitive to slights and so easily broken by betrayal. It never ceases to amaze any of us involved in rescue work just resilient the laboratory survivors are. Both biologically and metaphorically “the heart” it takes for a sweet little beagle, like Yoyo, to endure nine years of caged confinement,…