[header] How to breed yorkies [title] Determine if your yorkie is old enough to breed. [step] A female yorkie should not be used for breeding until she is 2 years old. A male yorkie will generally have viable sperm when he is over a year old. 
[title] Assess whether your dog has the right physical traits for breeding. [step] Does your dog have desirable breed traits? Does it meet breed standard minimums? According to the american kennel club a yorkie should exhibit these traits : [substeps] The yorkie's body should be compact and well proportioned.