1) In domestic breeding -- let's stick to dogs -- do you agree that you get and maintain a breed by being sure you breed it with its own type?
Sure, but inbreeding becomes a problem especially if isolation is present. Mutts are far more genetically diverse than pure breeds.
2) Do you agree that this is to protect the breed's particular allele complement from contamination from alleles of other dog types?
Well, if you want a pure breed dog, then I suppose yes.
3) Do you agree that any dog breed possesses a very limited genetic diversity with respect to the total dog population?
Yes
4) Do you agree that it is its limited genetic diversity that is the basis for the characteristics of the breed itself and that if there is any increase in the genetic diversity the breed will lose its character at least to some extent?
What do you mean by "lose its character?"
5) Do you agree that Darwin based his natural selection on domestic selection?
No, not entirely. I would think Mendel would be more prone to this. Don't you recall the numerous excursions all over the planet? Don't you recall instances, like on the Galapagos, where he noticied distinct characteristics in their iguana population that differed considerably from other South American iguana? Those weren't domesticated and neither were most of his studies.
6) Do you agree that natural selection is the "engine of evolution?"
There are several factors, but that is one component within the engine.
7) Do you agree that the end goal of evolution is speciation or is evolution simply any change at all whether it ever leads to speciation or not?
I don't believe there is any "goal," as a goal would be indicative of intent. Change is simply an inevitability.
"Political correctness is tyranny with manners." -- Charlton Heston