>>Hi there I'm new to this forum this evening.
>>I am thinking of breeding my minature yorkshire terrier, She is 2 years old, she weighs 5lbs and her name is 'Tisha'
>>She is the first dog we have ever had, and I would like her to have a litter of pups before we have her done. I am hoping this is going to be an easy thing to go through for her as I am compleatly new to this. My sons, 26 16 14 13 & 10 yrs old are so excited about Tisha becoming a mother. Any advice would be great, thanks in advance. 
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Dogs this size are at very high risk of death from breeding. If you're not prepared for it to kill her, truthfully, you should not breed her. It might seem that breeding is a natural thing, but in dogs this size, it is the farthest thing from natural. Talk to your veterinarian, and let the vet know that you want the real truth about the risks. Otherwise, because vets need to keep clients and that income, they will often let you believe whatever you want to believe rather than argue with you to try to get you to understand something you don't want to hear in the first place.
Also, ask about the cost of a C-section. And then ask what it costs if your dog needs it done during emergency hours. Be prepared for a shock. Buying another puppy is cheaper, and it also preserves your dog's nice temperament as well as sparing her the risk of death.
I have an article on Breeding Your Dog and one on Spay/Neuter Behavior Benefits at the link below my name, a free veterinary educational site with no advertising.
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Kathy Diamond Davis, author, "Therapy Dogs: Training Your Dog to Reach Others," 2nd edition, and the free Canine Behavior Series articles at http://www.veterinarypartner.com/Content.plx?P=SRC&S=1&SourceID=47