Need a new pair of jeans? Use your purchasing power to help protect pups in Chicago at Bloomingdale's "Doggies and Denim" showcase from 6 to 8 p.m. on March 20. Watch a runway show of the 900 N. Michigan Ave. store's latest denim trends, then shop the looks. Ten percent of all proceeds will be donated to Safe Humane, which works to inspire positive relationship between people and animals across Chicago.