Yogurt can be made and has been made from cow, goat, sheep, horse, camel, water-buffalo, and yak milk – and probably others that we don't want to think about.

We cannot claim to know how many of those have been used in Greece to make yogurt over the past couple thousands of years, but the list certainly includes cow, sheep, and goat.

The leading brand of Greek yogurt that is sold in this country (and now made in this country), Fage, is made of cow's milk.