Physics for Dogs

The problem:

A fourteen pound dog, wearing a leather collar, clipped with a metal clasp and on a steel cable leash attached to a metal stake corkskrewed into the frozen ground--takes off across the yard after a rabbit.

The question:

What element breaks first?

The solution:

Ha! Trick question! The leash was clipped onto a metal ring which held the city license, the pet return information (for the microchip), the rabies tage AND the name plate with the dog's name, address and phone. All of which fell into the snow and buried themselves immediately. I managed to catch the dog in the neighbor's yard, and I found all but the rabies tag, which will certainly turn up in the spring thaw.