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The don't breed, they just occasionally produce offspring--live, but not viable.

Post your link, please

Chihuahua's and Great Danes - variations of the same form?

Oh yeah that's right Chihuahuas are actually Cricetidae(rats and mice)

How is it, then, that most interfamily matings are void of offspring, if speciation is really just hybredization by another name

And this statement holds up evolution, sounds like you are speaking from both sides of your mouth now, using the invisible divide in one post and impassable divide in another.

Is your new tune that families were independently created, but species were not?

I think form post 1 I have been speaking of families but intermixing the word species (my mistake), but all my posts have followed the same line, you can't mate a dog with a cat and come up with a cog or a dat, as you claim ( with out genetic manipulation by humans, but that would be intelligent design wouldn't it)