Went on our walk this morning at the park with my friend, per the usual. 2 miles in, after crossing the bridge, Kaiser started limping on his RF leg.
Thank god my friend was with me to watch him while I got back to my car to get him home. Of course me, being paranoid, immediately began to jump to worst case scenario type conclusions given his history. He's at work with me now, just waiting for it to slow down so we can get him x-rayed and see if there's anything going on.