You might be interested in this question:

What are the audible symptoms of a failing starter motor?

The diagnosis in that question and answer period was that I probably had an aging starter motor (correct).

Grinding sound during cold start?
The concrete floor in my garage had been home to a large dog for several years.  There is a visible stain and strong smell in one area of the garage floor.  The concrete does not appear to be sealed or painted.  What is the best way to remove the odor?
