I know you said you typically make the loop around your neighborhood but inevitably Kaleb walks down the driveway with me and goes to the right.  So, that's the way we go.  We hadn't gone too far (maybe only 5 minutes) and Kaleb decided to turn around.  (Again, we go where Kaleb wants to go.)  We were almost to your house and he started limping slightly.  I think it was his back right leg.  I'm not sure if he stepped on something or what because it didn't last very long but I decided that was the end of our walk.  He was totally fine within less than 60 seconds and wanted to keep walking but I figured that was enough.   Bless his heart.  I have such a soft spot for the old guys.