Variations in DNA from generation to generation.
It exists prior to large dogs and small dogs.
And your evidence for that is...?
Do you get up in the morning look at your computer and say, Man, Im glad that computer evolved for me.
No. Computers don't reproduce themselves. Comparing the construction of a computer to the evolutionary process would be stupid.
So tell me again where all this complex genetic information comes from. exactly where. Prove to me the source of NEW genetic information.
I at least gave you an example of mendle, who proved the genetic information existed prior and our work in breeds is just manipulation for expression.
You gave me garbage and NO PROOF. Except magically the variations appear.
The complexity of a dog or tree does not magically appear anymore than the complexity of a computer on your desk.