I was working on the small stone wall for the garden in the front yard. I had Trooper on the tie out with me, hoping that it would help keep him away from the kids (ours and a couple of the neighbor kids). It only worked for a little while, until the kids migrated to the front yard. While playing in the front yard, they heard the ice cream truck.
The eldest girl took off down the side walk to the street corner a couple houses over to look for the ice cream truck. Trooper ever in play mode ran towards her and was stopped by his tie out cable, briefly. The next thing I knew Trooper was across the neighbor yard and on the side walk with the girl.
When I got him and inspected the cable and behold, one of the loops holding a clip had been severed.