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CHICAGO — A Chicago law banning the sale of animals from so-called puppy mills can now take effect.

A federal judge has dismissed a suit brought by pet stores and large-scale breeding operations to kill the ordinance.

The measure, passed last year, blocks stores in Chicago from selling dogs, cats and rabbits obtained from puppy mills.

Retailers are allowed to sell animals from shelters, rescue operations or humane societies.

The ordinance goes into effect immediately, but the city hasn’t decided when enforcement will begin.