It's the most bitter compound know to humans, with a detectability down to 0.05 ppm, and average aversion dosing around 10ppm. Lab tests show that some animals require 100,000 times the dose before detection. This discrepancy is leveraged for another application - making rat poison repulsive to children without reducing its efficacy.
I take small pride in the idea there’s something I can taste better than my dog. All I ever hear is how their senses are orders more heightened than our own. Do you know if there are any smells that humans can detect better than dogs?
https://www.sciencedirect.com/science/article/abs/pii/S00319...