As far as I can tell, we have invented tools and algorithm to:

* Detect a wider range of colors at a larger range than humans or any other animals on the planet
* Detect sound with wavelengths inaccessible to humans or most animals on the planet

But why is it that dogs can smell [COVID](https://www.nature.com/articles/d41586-020-03149-9) or [Cancer](https://www.hillspet.com/dog-care/behavior-appearance/can-dogs-smell-cancer) and we can't produce a similar tool to "smell diseases"? Why can't we mimic the dog's sense of smell: is it a hardware limitation or a software one? Am I mistaken in thinking that this sense is the hardest to mimic?