It was not known late Wednesday how the dog wound up in Lake Michigan, or who the owner was.
"I just feel like if we don't do it, it just doesn't get done," said Tatiana Soto, a single mother.
The special runs from 10 a.m. to 6 p.m. at the shelter's West Side location.
The Chicago Fire Department tried to get the cat out of the South Side unit, but it ran into the flames instead with a more daring plan.
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