Amazing that there would be any smell left for the dog to sniff after 65 million years. I’d have thought it would be completely mineralized.
The gal who discovered collagen and and soft tissue remnants inside T-rex bones said she was inspired to look because of the "smell" fossil bones have.
"she noticed that the fossil exuded a distinctly organic odor. "It smelled just like one of the cadavers we had in the lab who had been treated with chemotherapy before he died," she says. Given the conventional wisdom that such fossils were made up entirely of minerals, Schweitzer was anxious when mentioning this to Horner."
https://www.discovermagazine.com/the-sciences/schweitzers-dangerous-discovery
Some other dog probably peed on it recently.