About 2 years Two years
The permanent or adult grow when the Yorkie puppies are 4 to 8 months old. By around 8 months old, those teeth should fully develop. The permanent or adult teeth will grow in the order of incisors, canine/fangs, premolars and molars. Molar teeth will develop at around 6 to 8 months old. The defining features of the breed are its maximum size of 7 pounds (3.2 kg), but some Yorkies may exceed 7 pounds and grow to be up to 15 pounds. It has a gray, black, and tan coat. I'm not aware of any other Yorkies older than 24,and this was in human years Billy a Yo … rkshire Terrier is believed to be the oldest living dog in the world. He is a 22 years old canine, which is equivalent to 154 human years.  AKC Guidelines require the male to be at least 7 months and the female has to be at least 8 months or you can not register the litter. Its best to wait until your male is at least 1 yr. I always wait until my females 2nd heat, makes for a better mother dog. I would also like to know since I have a gorgeous AKC registered male yorkie I would like to stud for a puppy. He is 7 months old and a little over 4 lbs. Vet seems to think he will weigh about 5 lbs. I am not sure if 7 months is considered full grown Teddy the Yorkie at 2 1/2 years old. Teddy the Yorkshire Terrier at 1 year and 8 months old. Toby the Yorkshire Terrier as a puppy at 4 months old. Nacho the Yorkshire Terrier. Nacho the Yorkshire Terrier. This is Ollie at 3 months. She is my first Yorkie and I am finding her to be nothing like I expected. Layla the Yorkie at 3 years old— Layla is a 3-year-old, 6.5-lb. Yorkshire Terrier. She is the perfect addition to our family, and by doing our homework in advance, we were able to avoid the problem behaviors that can occur when owning a small dog. Tips for Breeding Yorkies The Right Way. If you are interested in breeding Yorkies, there are many things you need to realize about this breed. It should be much more than just a way for you to make some money from selling the puppies. You need to be very passionate about this breed of dog. That means as a breed they will be healthier than before. Many experts state the Yorkie breeding age should be about two years for both the males and the females. This way they are fully mature and it also gives time for genetic problems to be known. If you breed them younger than that, then some of the problems may not have had time to emerge Because this breed is so small, when a female is going to be paired with a male, the female should weigh more than the male. This is a key component in aiding the dam to carry well and deliver with the least possibility of complications. The male should be under 4 pounds (1.81 kg) or 4 pounds maximum. The male's parents should be between 4 and 5 pounds (1.81 kg to 2.26 kg). Doing this, will give the female Yorkie a better chance of being able to have her puppies naturally. When these guidelines are not followed, there is a greater chance that the female will need to have a cesarean section. On the flip side, after the age of 5, with 7 being the absolute limit, the female needs to rest. If a person is only planning 1 litter and does so when the dam is 4-5 years old, another litter can be carried safely at age 7. However, if a dam has had 3 or more litters, she should be retired at the appropriate age of 5 I have a 15 month old female yorkie and she is in heat, i also have a 5 month yorkie male and i was wandering if they would produce anything if they tied. Update: I didnt ask for opinions i just asked for facts yes i am new at this i was told that u can breed a female when she goes into her 2nd heat...in which she is. 
https://en.wikipedia.org/wiki/Yorkshire_Terrier http://www.answers.com/Q/What_age_can_you_breed_your_male_yorkshire_terrier http://www.faqs.org/qa/qa-21691.html http://www.dogbreedinfo.com/yorkshireterrier.htm http://www.myyorkiesecrets.com/yorkshire-terrier-breeders/tips-for-breeding-yorkies-the-right-way.php http://www.yorkieinfocenter.com/breeding-yorkshire-terrier https://answers.yahoo.com/question/index?qid=20090327181539AA99pKw
what age can a yorkie breed