THEY WERE COURSING A HARE
well it knows what 2 down the when tough gets going ,far 2 young ,i,ve read somewear that a dogs lungs are even fully development till 16 /18 months and long hard runs can damage them and scar them for life ,just my opion i sure the longdogs men will clear this up for you
read dis to and seen it in a dog not good shud hav more sense id say she prob lost interest