That is called linebreeding.From what I read alot of breeder do this to improve the breed.But if you don't know what your doing it is more harm than good.You can breed mother and son or father and daughter but not brother and sister from the same litter.I am not an expert but this is what I learned here so far.
I'm sure our experienced breeder her can fill in the fine details.You can ask Yorkierose or Whispersmom,I've learned alot from them and I'm sure they can give you their wisdom in this one.
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