Structure of reproductive systems?
How fertilisation happens?
How and where the embryo develops?
Birth?
Parental care?

Sounds like you need to find a serious dog resource as that's really outside the scope of this site.
Here's some reading for starters: Dogs on About.com - All About Dogs and Puppies (http://dogs.about.com/)

I agree with curlyben that is outside the scope of this site.