Purchasing a Yorkshire terrier from a reputable breeder who follows confirmation guidelines and does genetic testing is one of the best things you can do for the Yorkshire terrier breed and the best way to 'know' what you are getting. Rescuing a dog is a wonderful thing in its own right and great for that one dog, may end up being great for you too but on the whole, supporting a reputable Yorkshire terrier breeder whose Interest is in perpetuating and supporting the health, wellbeing and standards that 'is the Yorkshire terrier' is a great contribution to our beloved breed and a much better way to know you're getting what you wanted