Well, you know you're supposed to rotate your several pairs of running shoes, and write the dates in them, if they are all the same, so you know who's the oldest- then when you retire a pair, they still have plenty of miles left for dog walking.

I have about six pairs of running shoes in my rotation right now- a pair of trail shoes, (but all I do is run on trails, anyway) a pair of cushy really expensive Asics for long runs where I expect my knees to hurt eventually from hills, and for recovery runs after my knees hurt, and four pairs of my beloved Asics Gel Lites in various stages of wear, plus in two different sizes- I wear the larger size, which is a whole size bigger than normal, for long, long runs when I know my feet will swell. Then there is a smaller, super-dirty pair for mud and rain. You get the idea...

Nanci