BLUE EYES AND MIXING BREEDS
There is ONLY one way to get the BLUE EYE GENES in a dog breed that has NOT ever had blue eyes for 100s of years and that is by breeding in the gene and then LINE-Breeding the Miniature Schnauzer traits back into the dog. The Blue Eye gene is a dominant gene which is why for 100s of years the breeds KNOWN for blue eyes have blue eyes often. This takes a period of about 7 to 10 years to get the Schnauzer bred back into the lines while keeping the gene for blue eyes. See the examples below.