This may explain a bit:
Hunting in upstate NY with my brother, mixed hardwoods between tracts of apple orchards. Dogs barking, getting closer. A doe breaks out from a brushline at full lope. Dogs about 50 yards in full pursuit. Glimpses of the doe and pack for the next 5 minutes, more or less. Then no more barking. Brother finds the doe crumpled over 100 yards from the orchard boundary near a trail road. No bullet wounds, no bleeding, dogs gone.
Curious, he opened the doe and found the heart with a tear in the side. Surgeons would call this myocardial infarction. Those dogs ran that doe to her death for sport. Then went home for a warm night with the fam.
This is why I will shoot dogs running deer in my neck of the woods.