Flipping through a record of all of the dairies that were once located in Pennsylvania, Carl Colteryahn III tells me that dairies used to be everywhere.
"Back then, with no refrigeration, you could only deliver as far as the horse could take the milk before it got too warm," Colteryahn, the fourth-generation president of Colteryahn Dairy, said.
There were about 2,000 in Allegheny County over the years. Today, Colteryahn Dairy is one of only three.
Colteryahn Dairy is the oldest dairy in Pittsburgh, founded in 1893. Colteryahn thinks what sets his family dairy apart has been their foresight.
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