purchasing a yorkie female that I plan on breeding

Question
I do not know if I chose the right female. She is 1 lb 2 oz and just over 5 weeks old. The breeder said she may be to small her mom is about 6.5 and her dad is about 4.5 lbs. There is another female and she weighs 1 lb 7 oz they are sisters. I am not sure what to do. I can move my deposit but I really like the looks of the smaller one. I have pics of all the dogs if you would like some she was a litter of 5 girls and one male. They told me the larger the female the better pretty much I think they are awesome people and have answered a ton of questions for me. But it does seem like they choose the largest females for breeding because you get larger litters. They told me if the female is to small she may have problems whelping or she may only have 1 or 2 puppies per litter. She is from a very large litter.  I do not know what to do according to the weight charts she will be 4.5 lbs and the larger girl will be between 5.5 and 6 lbs. I have a yorkie male and female that are 7 and 8 mos old and both of them are larger than what the weight chart said they would be. My male weighed 2 lbs 10 oz at 16 weeks which put him at 4.5 lbs but now he is 7 mos old and already weighs 4 lbs 10 oz. So I am not sure. If I am going to move my deposit to the bigger girl I need to do it before someone puts a deposit on her. I love the looks of the one I picked but I do plan on breeding the girl when she is old enough and I do not want to breed a yorkie that is to small or not be able to at all. Thanks

Answer
Stephine,

First let me start by saying that this is a very difficult question to answer. That is because there is no definitive answer to the question and there are a lot of gray areas.

The ideal weights to breed are a 2.5 to 3 pound male to a 5 to 6 pound female.  This combination usually produces teacup yorkies which is what people want.  I don't know what "size chart" you are referring to but in my experience there is no definitive way to tell what size a yorkie is going to be by using their weight at certain ages. The best indication is usually using the weights of the parents. Over the years I kept track of the weights of my dogs from birth to adulthood hoping to find a pattern so I could tell how large they would be.  What I found was that there was no pattern. What you can usually say with some certainty is that if you breed a 4 pound male with a 6 pound female you are going to get a puppy that is 4 to 6 pounds.  

Your male is going to be to large to use for a stud.  You never breed a female with a male that is larger or the same size as she is because the risks from complications during birth are too high.  If you are going to have a stud you will need to find one that is going to be 2.5 to 3 pounds when full grown.  Your best bet to get a stud like that is finding a mating couple that is small.  A 2.5 pound male and a 5 pound female pair would be your best shot at getting a small male.

I sympathize with your dilemma about which puppy to purchase.  It may be that the one you want is going to be too small to breed but there is no way to tell at such a young age.  She will probably be smaller than the other one but you really can't be certain.  Because the parents are the best indication I would ask the breeder if she knows the sizes of the puppies (when full grown) that she has previously sold from this breeding pair.  It may give you an indication of what size your puppies are going to be.

I wish I could be more help but this is one of those areas where things are not black and white answer.  If it were me I would probably give up my deposit and wait to purchase a female that I liked the looks of and felt was going to be larger.  After all you are purchasing an investment that is going to have to last for a long time.