Fur Collector; I know these don't show the placement of organs but it may give you an idea. This is a gray fox.
Chest with front shoulder in place. Thumb as reference of shoulder size. Shoulder pulled out of way. From finger tip to almost thumb would be length of vital. Figure a 3x5 index card size and your good.
Fur Collector, I have a degree from UAM and grad degree from UCA. Live in Bentonville and hunt some in Arkansas bur primarily in Kansas & Missouri for turkey, predators & deer. Did consider joining a club near Monticello or Kingsland but am in club, Hunting Sports Plus, but they do not allow rifles for predators so limited to shotgun there. Recently retired from a university in Missouri then moved to Bentonville to be near family. Steve