That's even worse in a confined space like a car. Couldn't smell mine, so hopefully dentist and nurse didn't either. Though there was so much of it, it was obvious to the eye. Had one that turned my stomach couple of weeks ago. Once again I was walking along leaf covered pavement which makes it more difficult to spot any nasties. Anway, stepped on something that felt a bit soft, but carried on without taking too much notice. On the way back I spotted a flat dead rat in the place where I had felt something a bit soft under foot.
Last year I nipped down a lane behind a Lidl in France for a Jimmy. Unfortunately I stepped in a big one that obviously wasn't animal - which seems 10 times worse somehow. Didn't want it all over the carpets in my nice clean hire car that I had only picked up a few hours before. Ended up walking down to a conveniently located river, knelt down on the bank, removed the shoe and washed it off. If there's something really nasty within a 10 mile radius, my shoes seem to be magnetically drawn to it.