Large, bone-crushing dogs stalked 'Rhino Pompeii' after Yellowstone eruption 12 million years ago, ancient footprints reveal

Researchers have found footprints of large, bone-crushing dogs in the 12 million-year-old Ashfall Fossil Beds in northeastern Nebraska, suggesting these large carnivores may have survived a cataclysmic Yellowstone eruption that covered parts of North America in ash.