I think spaying around 6-8 months is ideal so if any baby teeth have not fallen out yet they can be taken out during spay.
Also I don't think breeding any pet quality dog is a good idea. And at 4 months, it's much too soon to know if she has all the qualities to breed. Additionally, if she has no champions in her background, and worse yet from a broker or mill, or not AKC, she should def not be bred. Same goes for the male dog.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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