Yorkshire Terriers are extremely difficult to bred,
hernia or not. These are VERY tiny
dogs, and the problems that come along with breeding them can end up costing you not only thousands of dollars, but they can also cost you the life of your dog and/or her puppies.
If you look at the Yorkshire Terrier breed standard as written by the AKC (American Kennel Club), it tells you that a Yorkshire Terrier should weigh between four and seven pounds. A three pound Yorkie is EXTREMELY small.