Maybe because half marathons are usually run on less rural turf and runners are spaced closer they're more likely to pick up a loose dog without drawing much attention except for the runners.
I got the impression the Alabama dog didn't stay with the same runners for the whole race, but spent more time at the water stations. Probably they wouldn't hand he a cup and had to scrounge what the runners discarded.
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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