We know for sure animals smell better than us, and that our sense of smell changes with our age. Dogs for instance are able to detect scents that go unnoticed by us.

There is a big part of our existence that goes unnoticed because we are not able to detect all the smells out there. Yet, just imagine if we could, our world will be such a smelly place that we may get sensory overload and we may be overwhelmed by the experience.