The production of clean, abundant and high quality milk depends on the safety of the udder, which is reflected in the economic return for dairy cows breeders. Mastitis is the most common disease that causes severe economic losses as it reduces the quantity and quality of milk produced. In addition to this, cancers, tumors, infections and problems affecting the udder, and for these reasons combined, we decided to write this book, which contains the most important questions and answers on udder problems, based on Personal experience and scientific information on the Internet.