We started breeding miniature Guernseys in 2010. It is still a breed in progress. Cajun Milk Cows has mini Guernseys that are between 40"and 44". The smallest calf we've had born is 23". We register our mini Guernseys through the American Guernsey Association to test for Guernsey purity, dna verify parentage; and because there is no mini Guernsey registry. We use small, registered Guernsey bulls for purity.