I lost my first Yorkie Tucker to Liver Shunt Disease he had no symptons till 3.5 but it is heredity thats why everyone really needs to get a great breeder....This breeder that I got him from still is breeding, she was banned from AKC then everything went in her sons name and he got banned from AKC now they are using her daughters name...Some people are just in it for the money...so really be careful.....