I don't know if they still use Vicks, but that is exactly what and why it was used in morgues and during autopsies.

I just happened to be hanging around a dog show once, and overheard a woman with a German Shepherd say she put some Vicks on her dog's nose, just in case some fool brought a [censored] in season to the show (very distracting). Then she realized that soon after the Breed competition came his Utility Class... which included scent discrimination...

Sue