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John HartKomdo, owned by Brian Fain of Utah, worked hard in the dog pull.

With chest muscles straining into their harnesses, heads down, and nails digging into the earthen track, a group of American bulldogs and pit bulls from all over the West competed in Penn Valley over the weekend to see who could pull the heaviest load.

The dog pull, as it is known, is an international sport that has specially bred and trained dogs pulling sleds heaped with metal and concrete down prepared tracks.