Cats and dogs don't have the ability to appropriately break down the lactose in dairy, and consuming it can lead to diarrhea, vomiting, and other issues. (prevention.com)
The milk's natural enzymes are preserved which breaks down lactose and increases the availability of nutrients like calcium and protein into the body. (drjockers.com)
I think the bacteria in the culture process can help break down lactose sugars. (101cookbooks.com)